First-Class today: letters live, packages moved
The name First-Class covers a living service and a retired one, and search results blur them. First-Class Mail — letters, cards, large envelopes up to 13 ounces of paper-weight correspondence — remains the everyday mail service, unchanged. First-Class Package Service — the parcel product sellers loved for under-a-pound shipments — was folded into USPS Ground Advantage in 2023, which now owns that niche end to end.
If you're pricing a lightweight parcel, Ground Advantage is the current answer and inherits everything that made First-Class Package the e-commerce default: ounce-band pricing, tracking, every-address delivery.
What still ships as First-Class Mail
The letter service retains a seller-relevant corner: genuinely flat, thin items — trading cards in rigid sleeves, stickers, photographs, paper goods — can travel as First-Class Mail letters or flats at postage far below any parcel rate. The constraints are physical (thickness, rigidity, machinability) and functional: letter mail lacks parcel tracking, and adding non-machinable surcharges or rigidity can erase the savings.
The honest rule: use letter rates for low-value flat goods where a lost piece is an acceptable cost of the postage saved; the moment tracking matters, Ground Advantage's lowest band is the floor.
ℹ️ Marketplace sellers: platforms generally require tracked shipping for seller protection — untracked letter-rate shipments usually forfeit it. Price that risk, not just the postage.
Updating old habits and old listings
Years of e-commerce muscle memory reference First-Class Package — in saved platform presets, shipping policies, and listing templates. Those presets now map to Ground Advantage rates in every major tool; the names changed while the codes migrated. Worth a one-time audit: stale wording confuses buyers, and stale automations occasionally mis-map to slower or costlier services than intended.
For letters-and-flats sellers, meanwhile, nothing changed at all — the oldest mail service in the country continues doing exactly what it has always done, one Forever stamp at a time.
Metered mail and online postage for the letter tier
Even the humble letter has a commercial lane: online postage and metered mail price below retail stamps, and for businesses sending real letter volume — invoices, notices, cards — the discount compounds quietly. Printing postage from the desk also timestamps and standardizes outbound mail in ways a stamp drawer never will.
The boundary to respect is trackability: letter-stream mail moves without parcel tracking, and no online-postage convenience changes that. The moment an item's loss would trigger a customer conversation, it belongs one tier up in the parcel stream — the letter lane is for correspondence and for goods cheap enough that certainty isn't worth the upgrade.