How to Pack a Box for Shipping — Complete Guide

A shipping box travels through conveyor belts, sorting machines, and multiple handler hand-offs before it reaches the door. The average parcel is dropped, stacked, and jostled dozens of times in transit. Packing it correctly is the difference between an item that arrives intact and a damage claim.

This guide covers every step: choosing the right box, internal cushioning, wrapping fragile items, sealing, and label placement.

Step 1: Choose the Right Box Size

Box size is the most commonly misunderstood part of packing. The goal is a box that's just large enough to hold your item plus 2 inches of padding on all sides — not the smallest box that physically fits the item, and not a giant box with the item rattling around inside.

• Too small: the item touches the walls, corners, or lid. Any external impact transfers directly to the item. The box may also exceed dimensional weight limits, costing you more.
• Too large with insufficient fill: the item shifts during transit and can impact walls repeatedly, causing damage equivalent to dropping it repeatedly.
• Correct size: 2 inches of cushioning on all six sides (top, bottom, all four sides). This absorbs corner and edge impacts from conveyor drops and sorting belts.
• Reusing boxes: inspect reused boxes for weak corners, crushed edges, or previous damage. Flattened corners indicate the box has already absorbed an impact and may not protect as well on the next shipment.

Step 2: Line the Bottom with Cushioning

Before placing your item in the box, add a cushioning layer on the bottom. The base of the box is the surface most likely to be set down hard:

• Bubble wrap (minimum 2 inches): ideal for fragile items. Use small-bubble wrap for items under 1 lb, large-bubble for heavier items.
• Foam peanuts (packing peanuts): effective for lightweight items in larger boxes. Use enough that the item can't sink to the bottom.
• Crumpled kraft paper: good for non-fragile items. Crumple tightly — loosely crumpled paper compresses under weight and stops providing protection.
• Air pillows: efficient for filling void space in larger boxes with medium-fragility items.

Step 3: Wrap Fragile Items Individually

Each fragile item — glass, ceramics, electronics, anything with corners or edges that can crack — needs individual wrapping before going in the box:

1. Wrap each item separately in at least 3 inches of bubble wrap. Start at one corner, wrap diagonally, and secure with tape.
2. Pay extra attention to corners and protrusions — these are the points that break first on impact.
3. Place wrapped items in the center of the box, not against the walls.
4. If shipping multiple fragile items together, wrap each one individually AND separate them with cushioning material so they can't contact each other if the box shifts.
5. For electronics: if the original manufacturer's box is available, use it — it was engineered specifically to protect that item. Place the manufacturer's box inside a larger shipping box with 2 inches of external cushioning.

Step 4: Fill All Void Space

After placing your item(s), fill all remaining space in the box with cushioning material. Void space allows the item to shift and builds momentum for impacts. The box should be full enough that the top doesn't flex down when you press it:

• Fill around all four sides of the item, not just above it
• Add a top layer of cushioning before closing the box — the top flap is a common failure point when boxes are stacked
• Press down on the center of the closed box lid: if it gives more than 1/4 inch, add more fill

Step 5: Seal the Box Correctly

The H-tape method is the carrier-recommended sealing pattern for shipping boxes:

1. Close both pairs of box flaps (inner flaps first, then outer)
2. Apply tape down the center seam of the top flap
3. Apply tape along both side edges of the box top (perpendicular to the center strip) — this forms the 'H' pattern
4. Flip the box and repeat the same H-pattern on the bottom
5. Use 2-inch wide packing tape rated for shipping. Avoid masking tape, scotch tape, or single strips of thin tape — these fail under pressure.
6. For heavier boxes (over 20 lbs): add a second strip of tape parallel to the center seam for additional reinforcement.

Step 6: Attach Your Shipping Label Correctly

The label placement is the last step — but do it wrong and the package may not be delivered even if it arrives intact:

• Place the label on the largest flat surface of the box — typically the top
• Avoid placing labels over seams, corners, or tape strips where the surface is uneven
• Do not fold the label over an edge — barcodes must lay flat to scan correctly
• Cover the entire label with clear tape to protect it from moisture, but do not tape over the barcode itself (tape glare can cause scan failures)
• If reusing a box: completely cover or remove all previous labels and barcodes before applying your new label. Old barcodes are still machine-readable and will misdirect your package.
• If shipping internationally: place the customs form flat on the same face as the shipping label — never fold customs forms or place them under the label.

Box Type and Weight Limits

Not all cardboard boxes are created equal. Carrier requirements and box strength ratings affect what you can ship:

• Single-wall corrugated (most standard shipping boxes): rated for up to 20–40 lbs depending on thickness. Fine for most ecommerce shipments.
• Double-wall corrugated: rated for 40–80 lbs. Use for heavy items, dense contents, or anything fragile that needs extra protection.
• Triple-wall corrugated: rated for 80–250+ lbs. Used for industrial parts and very heavy or hazardous shipments.
• Weight limits: UPS and FedEx both have per-package weight limits of 150 lbs. USPS has a 70 lb limit. Exceeding these requires freight shipping.
• USPS free boxes: flat rate boxes from USPS are available free and are pre-approved for Priority Mail shipping. For non-flat-rate shipments, use any sturdy corrugated box.
• Box ECT (Edge Crush Test) ratings: a box rated 32 ECT can support 32 lbs per linear inch of edge. For stacking-heavy or warehouse shipments, prefer 44 ECT or higher.

Packing Specific Items: Glass, Electronics, Liquids, Books

Different categories need different packing strategies. Here's how to handle the most common high-risk items:

• Glass and ceramics: wrap each piece in 3+ inches of bubble wrap, then place in a snug-fitting inner box, then place that inner box inside an outer shipping box with at least 2 inches of cushioning between them. Mark the outer box "Fragile" — though this only helps slightly, it's free.
• Electronics (laptops, phones, cameras): use the original manufacturer's packaging if available. Otherwise, anti-static bag → bubble wrap → snug-fitting box → outer shipping box with foam or pillows. Remove batteries when possible (reattach with insulating tape over the contacts).
• Liquids: must be in a leak-proof primary container, sealed with tape, placed inside a sealed plastic bag (zip-top or vacuum-sealed), then in a cushioned box with absorbent material (kraft paper, paper towels) inside the outer bag in case of leak. Many liquids require Ground Advantage shipping rather than Air services due to hazmat rules.
• Books: heavy, dense, and surprisingly damage-prone (corners crush easily). Use Media Mail for books only — the cheapest USPS service. Tight-fitting box with minimal void space; corner protectors recommended for hardcover books.
• Apparel: poly mailers are usually the right choice; they're cheaper than boxes and generate no dimensional weight overhead. For multi-item apparel orders, use a box only if folding compresses the items unacceptably.
• Artwork and prints: roll prints in tubes; never fold. Framed art needs glass-protector film, then bubble wrap, then a foam-lined art box. Mark every face with arrows pointing up.
• Jewelry and small valuables: padded mailer or small box with bubble wrap. Always use a service with insurance and tracking — Registered Mail for very high-value items.

International Packing Considerations

International shipments face longer transit times, more handler hand-offs, and customs inspection — packing matters even more:

• Use a sturdier box than you would for domestic — assume your package will be opened by customs and re-packed by hand at the inspection station
• Don't pack hazmat or items prohibited in the destination country — research before sealing the box
• Place the customs form flat on the same face as the shipping label, secured with clear tape
• Mark the box with country-of-origin if required (some EU countries require visible CE markings or origin labels)
• Use desiccant packets for moisture-sensitive electronics — international transit often passes through high-humidity climates
• Avoid wood packaging materials (untreated wood) — most countries require ISPM-15 treated wood, which uncertified pallets and crates don't meet

Common Packing Mistakes

Even careful shippers make these mistakes — avoid them and your damage rate drops dramatically:

• Using a box that's too big with only paper fill — the item shifts during transit
• Skipping the H-tape pattern and using a single tape strip — the bottom flaps pop open under weight
• Not removing or covering old barcodes when reusing a box — sorting machines may misroute the package
• Wrapping fragile items in newspaper instead of bubble wrap — newspaper compresses and provides no real cushion
• Sealing the box with masking tape, scotch tape, or duct tape — none of these are rated for shipping; only use 2-inch packing tape
• Stacking heavy items on top of fragile items inside the box — fragile items should be cushioned above and below
• Putting the label over a seam where the surface flexes — the barcode can warp and fail to scan
• Using a damaged or previously-shipped box without inspecting structural integrity — crushed corners are a sign the box has used up its protective capacity
• Shipping liquids without a sealed plastic bag and absorbent material — even a small leak ruins the entire box and other packages around it
• Not weighing the package before printing the label — labels with mismatched weight get charged at the carrier-measured weight plus a correction fee

Tools and Materials Checklist

Equip yourself for any standard shipment with this minimum kit:

• Sturdy corrugated boxes in 3–4 sizes covering your typical items
• Bubble wrap (mix of small-bubble and large-bubble)
• Packing tape (2-inch wide, shipping rated) plus a tape gun for high volume
• Air pillows or packing peanuts for void fill
• Kraft paper or newsprint for surrounding less-fragile items
• Scissors or box cutter
• Permanent marker for handwritten directional notes ("This Side Up")
• Postal scale (digital, 0.1 oz resolution) for accurate weight before label printing
• Clear shipping label pouches if you're shipping repeatedly to the same destination

Boxes vs Poly Mailers: Which One Does the Job

Boxes offer rigid protection and are necessary for fragile, heavy, or irregularly shaped items. Poly mailers are lightweight, flexible envelopes that reduce dimensional weight charges dramatically for soft goods. Choosing the wrong one costs you money in either extra postage (if you over-box) or damage claims (if you under-protect).

The decision comes down to three questions: Is the item rigid or soft? Does it need crush protection? What does it weigh, and what are the DIM weight implications of putting it in a box?

Poly mailers are ideal for clothing, fabric items, soft toys, non-breakable accessories, and flat documents. They're waterproof, tear-resistant, and add almost zero weight — keeping your billable weight close to the actual product weight. Standard poly mailers are not padded; for items that could be scratched or bent (books, photos, thin electronics), upgrade to bubble mailers (padded poly mailers), which add a layer of bubble wrap protection inside.

Boxes are required for anything fragile, rigid, or heavy. Electronics, ceramics, glass, candles, kitchenware, and most hard goods need a box with interior cushioning. Also use a box when an item is oddly shaped and would distort a mailer, or when its value warrants the extra protection and insurance coverage a box provides.

• Poly mailer: T-shirts, hoodies, clothing of any kind
• Poly mailer: soft toys, plush items
• Poly mailer: non-breakable jewelry (with padding)
• Poly mailer: documents, certificates, flat cards
• Poly mailer: fabric accessories (scarves, hats, bags)
• Box: electronics, ceramics, glass, candles, kitchenware and other hard goods
• Box: anything oddly shaped that would distort a mailer
• Box: high-value items where the extra protection and coverage are worth the postage

What Packaging Actually Costs Per Shipment

A 10×13 poly mailer costs $0.10–0.25 each in bulk. A comparable corrugated box (12×10×4) costs $0.80–1.50 each. Over thousands of shipments, that difference adds up — but the bigger cost difference is often postage, not packaging.

A soft item shipped in a poly mailer versus a box of the same size can save $2–5 per shipment in DIM weight charges on UPS/FedEx. For high-volume ecommerce sellers, packaging choices directly drive carrier costs.

Choosing Cushioning Material by Product Type

Packaging is a margin game. Under-pack and items get damaged, eating profit in returns. Over-pack and you waste money and space. The sweet spot varies by product — here is what each material is actually for.

Bubble wrap is the all-purpose protector for fragile items (glass, ceramics, electronics, jewelry). It comes in three bubble sizes, and the size matters more than most shippers realise: small bubble (3/16 in) for small delicate items, medium bubble (5/16 in) for most general use, and large bubble (1/2 in) for heavy fragile items. Wrap 2–3 layers around anything fragile. Bulk rolls are cheapest from suppliers like Uline, Amazon Business, and PackagingBrahma.

Kraft paper is the eco-friendly, low-cost option for void fill and for wrapping non-fragile items. The 30 lb weight is standard wrapping paper; 50 lb is heavy-duty and reinforced. It's curbside recyclable — a real sustainability win — and cheaper per foot than bubble wrap for pure void fill.

Packing peanuts and air pillows fill empty space so contents can't shift. Traditional EPS foam peanuts are the cheapest but are not recyclable; biodegradable starch peanuts dissolve in water and are the eco option; air pillows are the cheapest per cubic inch and the neatest to dispose of. None of them are a replacement for bubble wrap — peanuts fill space, they do not protect a fragile item on impact.

• Bubble wrap — small bubble 3/16 in: small delicate items
• Bubble wrap — medium bubble 5/16 in: most general use
• Bubble wrap — large bubble 1/2 in: heavy fragile items
• Kraft paper — 30 lb weight: standard wrapping; 50 lb weight: heavy-duty, reinforced
• EPS foam peanuts: cheapest, not recyclable
• Biodegradable starch peanuts: eco-friendly, dissolve in water
• Air pillows: cheapest per cubic inch, neat disposal
• Poly mailers — 2.5 mil: standard clothing; 3+ mil: multi-item or heavier soft goods
• Bubble mailers: kraft exterior + bubble lining, peel-and-stick closure — cheaper than bubble-wrapping and boxing a small item individually

Cheapest Adequate Packaging by Product Category

If you ship a narrow range of products, this is the shortest path to a packaging spec that protects the item without overspending:

• Clothing: poly mailer + optional tissue paper
• Books: bubble mailer or a Media Mail-appropriate box
• Jewelry: bubble mailer with a jewelry box inside
• Electronics: box with 2–3 in of bubble wrap padding
• Ceramics: box-in-box, multiple layers of bubble wrap
• Candles: box with bubble wrap, plus insulation in summer
• Fragile art: rigid mailer, or a box with corner protectors

Choosing Packing Tape: Type, Thickness, and Adhesion

Packaging tape is a supply most shippers buy on price alone — and then wonder why their boxes are arriving open. Spending a little more on the right tape often reduces damage claims by more than the cost difference.

Polypropylene (BOPP) tape is the most common shipping tape: an acrylic or hot-melt adhesive on a biaxially-oriented polypropylene film backing. Acrylic versions offer good temperature resistance and consistent bonding; hot-melt versions bond more aggressively and are better for cold-storage applications. It's inexpensive and widely available, which makes it the default for most shippers.

PVC tape uses a vinyl backing that is more flexible and conformable than polypropylene, so it stays usable in cold environments where polypropylene becomes brittle and loses adhesion. It is heavier and slightly more expensive, and it is the better choice for packages stored or shipped below 40°F.

Water-activated tape (WAT), also called gummed or kraft tape, uses a paper or paper-reinforced backing with a starch-based adhesive activated by wetting. Applied properly it becomes part of the box — it cannot be removed without tearing the cardboard, which makes it tamper-evident. WAT is the choice for heavy boxes, high-value shipments, and anywhere tamper evidence matters.

Two specs decide whether tape holds. Thickness (in mils) correlates with tear resistance: most commodity polypropylene is 1.6–2.0 mil, better tapes for heavy boxes are 2.0–3.0 mil, and beyond that you want reinforced tape or WAT rather than a thicker film. Adhesion is measured in oz/inch of peel strength: budget tape is often 30–50 oz/inch, which is fine for light boxes in temperate conditions, while boxes over 30 lb or shipments moving through temperature swings need 60–80+ oz/inch.

• Tape thickness: 1.6 mil for light packages, 2.0–3.0 mil for medium-heavy, reinforced for heavy
• Adhesive type: acrylic (temperature-stable), hot-melt (aggressive bond, cold-weather), starch (WAT, tamper-evident)
• Width: 2 inches is standard; 3 inches for heavy boxes needing extra coverage
• Core size: 3-inch cores for standard dispensers; check your dispenser before ordering
• Serrated edge vs blade cutter: serrated is safer, blade cutter is faster
• Kraft paper tape: eco-friendly and curbside recyclable; reinforced paper tape for heavy boxes
• Never use masking tape, duct tape, or cheap dollar-store tape — all of them fail in transit

Tape by Application, and Whether a Dispenser Pays Off

For everyday ecommerce shipping of packages under 20 lb in moderate temperatures, polypropylene acrylic tape in 2.0 mil is the best value. It handles well, does not stretch excessively, and adheres reliably to standard corrugated. Scotch, Shurtape, and Intertape all make quality options in this category.

For cold-chain shipments, boxes moving through refrigerated warehouses, or packages that originate or arrive in cold climates, PVC tape outperforms polypropylene. For heavy boxes (30+ lb), high-value shipments, subscription boxes where the unboxing presentation matters, or anything requiring tamper evidence, water-activated tape is the professional standard.

A good dispenser makes a genuine difference to packing speed and tape usage. Hand-held dispensers with tension control reduce waste and make consistent placement easier; for high volume, a bench-mounted dispenser or semi-automatic tape machine pays for itself quickly in labour time. Water-activated tape needs its own wetting dispenser — electric WAT dispensers are much faster than manual models and can be set to the length you use most. Budget for a quality dispenser when switching to WAT; wetting gummed tape by hand is impractical at any real volume.

Dimensional Weight: How Box Size Sets the Price

Dimensional weight, also called DIM weight, is a pricing method carriers use to charge for the space a package occupies rather than just its weight on the scale. A large, lightweight box takes up as much truck and aircraft space as a small heavy one, so carriers want to be paid for the space. The practical consequence: a package that weighs 2 lbs can be billed at 8 lbs, and if you don't account for it you will consistently underprice shipping.

The formula is straightforward: multiply length, width and height in inches, then divide by the carrier's DIM divisor. The result is the dimensional weight in pounds, and the carrier bills whichever is greater — actual scale weight or DIM weight.

The divisor varies by carrier. UPS and FedEx use 139 for domestic ground shipments. USPS uses 166, and applies DIM weight only to packages over 1 cubic foot (1,728 cubic inches). A lower divisor means more packages trigger DIM billing, so UPS and FedEx's 139 affects far more shipments than USPS's 166.

• DIM Weight Formula: (Length × Width × Height) ÷ DIM Divisor = DIM Weight (lbs)
• USPS divisor: 166 (applies to packages over 1 cubic foot = 1,728 cubic inches)
• UPS divisor: 139 (applies to all packages on most services)
• FedEx divisor: 139 (same as UPS for most domestic ground services)
• USPS Flat Rate boxes: no DIM weight at all — the price is flat
• Billable weight = greater of actual weight or DIM weight

Worked DIM Weight Examples by Box Size

Run these three against your own boxes before you buy another pallet of them. All use the UPS/FedEx divisor of 139:

Small box (12×9×4 inches): 12 × 9 × 4 = 432. 432 ÷ 139 = 3.1 lb DIM weight. If your actual package weighs under 3.1 lb, you pay the DIM weight rate.

Medium box (16×12×10 inches): 16 × 12 × 10 = 1,920. 1,920 ÷ 139 = 13.8 lb DIM weight. Even a 2 lb item in this box bills as ~14 lb.

Large box (24×18×12 inches): 24 × 18 × 12 = 5,184. 5,184 ÷ 139 = 37.3 lb DIM weight. A 10 lb item in this box bills as 37+ lb.

Apparel folded into a large box is the classic trap. A $30 hoodie in a 16×12×8 box weighs about 1.5 lbs but has a DIM weight of 11 lbs via UPS — a shipping cost roughly 7× what you'd expect. Switching to a fitted poly mailer bills at the actual 1.5 lbs and can save $8–12 per shipment. Subscription boxes are the other common case: curated products often end up in oversized packaging because the empty space looks intentional, and that space is billed every single month.

How to Cut Dimensional Weight Charges

The most direct fix is right-sizing. If your product fits in a 10×8×6 box rather than a 16×12×10 box, use the smaller one — every inch removed reduces DIM weight. Stock multiple box sizes and train anyone packing to reach for the smallest box that fits the item safely.

For regularly shaped products, custom-fit packaging built to your exact product dimensions costs more per unit than generic boxes, but if it removes a DIM surcharge from every shipment the maths often works. Calculate the annual saving before committing to tooling.

There is also a USPS-specific sweet spot: for packages between 1,000 and 1,728 cubic inches, USPS Ground Advantage avoids DIM weight entirely, which frequently makes it the cheapest carrier for medium-sized, lightweight packages in that range. And USPS Commercial Plus customers can opt into Cubic Pricing, which charges on volume (cubic inches) instead of DIM weight — for small dense items in a tight-fit box (5+ lb), Cubic Pricing often beats both DIM and zone-based pricing. It's available through Pirate Ship, Shippo, and other Commercial Plus providers.

1. Size boxes to match contents — 1–2 inches of padding, not 6 inches
2. Stock multiple box sizes and always use the smallest box that safely fits the item
3. Use poly mailers for clothing and soft goods — they conform to the contents and minimise DIM
4. For bulky lightweight items (pillows, bedding), consider USPS Flat Rate boxes — no DIM charge
5. Avoid over-packing with excessive void fill that inflates the box size
6. Calculate DIM weight before printing the label — ShipStation, Pirate Ship and EasyPost all display it once you enter dimensions
7. Use cubic pricing through USPS Commercial Plus if you regularly ship small dense items
8. Consider custom-fit packaging for your most-shipped product if DIM weight is a recurring cost

Custom Branded Packaging: What to Brand and What It Costs

Your shipping packaging is the physical touchpoint your brand makes with the customer. A plain brown box is functional; a box printed with your brand colours, a tissue paper reveal, and a note card creates a moment worth sharing. For DTC brands the unboxing experience is a marketing channel, and at the right order quantities it doesn't cost much more than plain packaging.

Not everything needs branding. Start with the elements that have the most visual impact per dollar — the outer box or mailer, tissue paper, and an insert card. Those three create a cohesive unboxing experience for under $1–2 per shipment at mid-volume. Custom printed tape on a plain box is the high-impact, low-cost shortcut. Branded packing peanuts, air pillows and filler are lower priority: they're functional and mostly hidden.

Custom boxes come in two forms. Custom printed boxes put your design on a standard box shape and start around 250–500 unit minimums at $0.80–$3 per box depending on size and print coverage. Custom die-cut boxes are engineered to your exact product dimensions and require larger minimums plus tooling costs. Overseas suppliers offer lower unit costs at 500+ minimums but 4–8 week lead times and more quality-control overhead.

For soft goods and lightweight items, custom poly mailers or kraft paper mailers are often more cost-effective than boxes and fully brandable. Custom printed poly mailers start at 100 unit minimums and run $0.20–$0.60 per unit; they're lighter than boxes, so they also cut postage.

• High impact: custom printed outer box or mailer (logo, colours, pattern)
• High impact, low cost: custom branded tissue paper — $0.10–$0.25 per sheet at 500+ quantities, 1–2 sheets per order
• Medium impact: insert cards (thank-you note, discount code, care instructions) — 4x6 or 5x7, full colour, $0.05–$0.15 each at 1,000 units
• Medium impact: custom tape on a plain box — 2-inch custom printed, $40–$80 per roll, covers roughly 65 boxes
• Nice finish: stickers for sealing tissue paper; ribbon or twine adds $0.10–$0.30 per package
• Lower impact: custom void fill, branded packing peanuts
• Skip (usually): custom inner cartons unless product presentation is critical
• Suppliers: Packlane (25-unit minimums, good for testing designs), noissue (sustainable materials, tissue and mailers), Arka (competitive at 50+ units), Lumi (design-to-factory platform), IndyPrints (inserts and printed materials)

Budgeting and Storing Custom Packaging

Track packaging cost per shipment in your shipping analytics. Total packaging cost — box, tissue, insert, tape and void fill combined — should run 2–5% of average order value for a premium feel. Above 5%, audit each element for necessity; not every shipment needs every element.

Custom packaging also means managing inventory across several SKUs with different lead times. Order enough to last 3–6 months, but not so much that a rebrand leaves you with obsolete stock. Store packaging flat and dry — moisture warps cardboard and makes boxes unusable. Timing batches to product launches or seasonal campaigns is a low-cost way to create seasonal packaging moments without redesigning the whole suite.

Frequently Asked Questions

What is the best way to pack a box for shipping?

Choose a box just large enough for your item plus 2 inches of cushioning on all sides. Wrap fragile items in bubble wrap, fill all void space, seal with the H-tape pattern, and place the label on the largest flat face.

How much should I cushion a fragile item?

Minimum 2 inches of cushioning on all six sides. For very fragile items (glass, ceramics, electronics), use 3+ inches and consider a double-box (item in inner box, inner box in outer box with cushioning between).

What's the H-tape method?

Apply tape down the center seam of the box top, then perpendicular tape along both side edges of the top — forming an H pattern. Repeat on the bottom. This is the carrier-recommended seal that holds under pressure and stacking.

Can I use any cardboard box for shipping?

Yes, as long as it's structurally intact (no crushed corners, no soggy or damaged areas). Single-wall corrugated handles up to 40 lbs; for heavier items, use double-wall corrugated.

Where can I get free shipping boxes?

USPS Priority Mail flat rate and weight-based boxes are free. Order at store.usps.com/free-shipping-supplies or pick up at any post office. UPS and FedEx do not offer free general-purpose boxes (only their One Rate / Simple Rate boxes are free).

Should I write "Fragile" on the box?

It doesn't hurt and is free, but realistically it has minimal effect — automated sorting equipment doesn't read text. Proper internal packing matters far more than fragile markings.

How do I pack a heavy item?

Use double-wall corrugated, fill all void space tightly, distribute weight evenly inside the box, seal with extra tape on the bottom, and consider double-boxing if the item is heavy AND fragile.

What's the best tape for shipping?

2-inch wide pressure-sensitive packing tape rated for shipping. Brands like Scotch 3850 or Duck HD Clear are reliable. Avoid masking tape, scotch tape, duct tape (poor adhesion when cold), and water-activated kraft paper tape (only effective at high volume with a dispenser).

Can I reuse a box for shipping?

Yes, if the box is structurally sound. Cover or remove all old labels and barcodes before applying the new one. Inspect corners and edges for crushing — if they're flattened, the box has lost protective capacity.

Why does my package keep arriving damaged?

Most damage comes from one of three issues: insufficient cushioning (item touching the box walls), wrong box size (too big with shifting room, or too small with no padding), or weak sealing (single tape strip instead of H-pattern). Address all three and damage rates drop dramatically.

Should I use a box or a poly mailer?

Poly mailers for anything soft and unbreakable — clothing, fabric, plush, flat documents. Boxes for anything fragile, rigid, or heavy. A 10×13 poly mailer costs $0.10–0.25 in bulk versus $0.80–1.50 for a 12×10×4 box, and the mailer can also save $2–5 per shipment in DIM weight charges on UPS/FedEx.

How do I calculate dimensional weight?

Multiply length × width × height in inches and divide by the carrier's DIM divisor: 139 for UPS and FedEx domestic, 166 for USPS. You are billed on whichever is higher, DIM weight or actual weight. A 16×12×10 box works out to 1,920 ÷ 139 = 13.8 lb, so even a 2 lb item in it bills as about 14 lb.

When does USPS charge dimensional weight?

Only on packages over 1 cubic foot (1,728 cubic inches), and at the gentler 166 divisor. That is why USPS Ground Advantage is often the cheapest option for packages between 1,000 and 1,728 cubic inches — they avoid DIM weight entirely. USPS Flat Rate boxes never incur DIM weight, because the price is flat.

What tape do I need for a box over 30 lb?

Look for 2.0–3.0 mil thickness and 60–80+ oz/inch peel strength, or step up to reinforced or water-activated tape. Budget tape at 30–50 oz/inch is only adequate for light boxes in temperate conditions. Some FedEx and UPS packing requirements for packages over 70 lb specify pressure-sensitive or nylon-reinforced tape, which standard polypropylene may not satisfy.

Which bubble wrap size should I buy?

Small bubble (3/16 in) for small delicate items, medium bubble (5/16 in) for general use, and large bubble (1/2 in) for heavy fragile items. Wrap 2–3 layers around anything fragile.

How much does custom branded packaging cost?

Custom printed boxes start around 250–500 unit minimums at $0.80–$3 per box; custom printed poly mailers start at 100 units and run $0.20–$0.60 each; custom tissue paper is $0.10–$0.25 per sheet at 500+; insert cards are $0.05–$0.15 each at 1,000 units; custom 2-inch printed tape runs $40–$80 per roll and covers roughly 65 boxes. Total packaging cost should land at 2–5% of average order value.