Tape the Face: A Safety Measure Before a Packing One
Mirrors carry a risk almost no other shipped item does: if they break, they can hurt someone. A shattered mirror inside a box becomes a container of loose glass shards, and the person who encounters them is a sorter, a driver, or the buyer reaching in. That's why the first step in mirror packing isn't cushioning — it's a grid of painter's tape across the mirror's face. If the glass breaks, the tape holds the shards in place rather than letting them migrate through the packaging.
Painter's tape specifically, because it releases cleanly from the glass without leaving adhesive residue the buyer has to scrape off. Run it in a grid — several strips each way, edge to edge — and understand what it does and doesn't do: it will not prevent a break, and it is not a substitute for the packing that follows. It's containment. Then face the taped glass with rigid cardboard before anything else, so nothing can press directly on the surface.
⚠️ A broken mirror is a laceration hazard for whoever opens the box. Tape the face in a grid, mark the outer box as glass on every side, and pack so the mirror genuinely cannot break — the person on the other end is reaching in with their hands.
Flat, Rigid, and Never Lying Down
Glass fails in a specific way: it's strong in compression and weak in flex. A sheet of glass that is allowed to flex — because it's unsupported across its middle, or because pressure is applied to its face — cracks. Everything about mirror packing serves the goal of preventing flex. That means rigid facing on both sides (corrugated or foam board spanning the entire mirror), corner protectors on the frame's corners (which take the impacts), and a mirror box: the telescoping flat cartons that exist precisely because this shape needs a purpose-built container.
Then orientation. A mirror should travel on edge, standing, never lying flat — a flat mirror is a shelf, and anything stacked on top of it applies exactly the face pressure that breaks glass. Mark the outer box so handlers know which way is up and that it must stand. Double-box anything large or valuable: the foam-protected mirror in its inner flat box, that box inside a larger one with cushioning between, so an impact on the outer surface dissipates before it reaches the glass. This is the same suspension principle our ceramics guide describes, applied to a large flat pane.
The Frame Is a Separate Problem
Most mirrors worth shipping are framed, and the frame introduces its own set of vulnerabilities that have nothing to do with the glass. Frame corners chip and split — they're mitred joints under tension, and they take the impacts. Ornate, gilded, or antique frames add finish that scratches and gesso that flakes; wrap them in soft material first, never bubble wrap directly against a delicate gilded surface where heat can imprint it, exactly as the antiques guide advises for aged finishes.
Foam corner protectors on all four corners are the highest-value thirty seconds you'll spend. Then pad the frame's perimeter along its full length so nothing can strike an edge. For antique and decorative mirrors, the frame is often the more valuable half of the object and the harder half to repair — a cracked pane can be re-glazed by any glass shop, while a shattered 19th-century gilt frame is a restoration project. Pack accordingly: the glass gets the taping and the rigidity, the frame gets the padding and the corners.
Size, Freight, and When Not to Ship at All
Mirrors scale badly. A small wall mirror is a manageable, if fragile, parcel. A full-length or oversized mirror is heavy, awkward, extremely fragile, and pushes into the oversize dimensions where surcharges bite — and past a certain size, parcel shipping stops being sensible at all. Large mirrors move as freight, crated, on a pallet, standing on edge and marked do-not-stack, with the same handoff documentation and delivery-inspection discipline our kayaks guide describes.
The honest advice most sellers arrive at: large mirrors are prime local-pickup items, and there is no shame in listing one that way. When shipping is genuinely required, price it honestly (it will not be cheap), pack it properly, insure it — and know that fragile-goods claims are frequently denied for insufficient packaging, so the documentation of your packing process is part of the coverage. Photograph the taped face, the rigid facing, the corner protectors, and the sealed box before it goes. Do all of that and mirrors ship successfully every day; skip any of it and you're gambling with glass.