Kill every barcode
Amazon cartons carry more than one scannable code. Run a marker over each, or place your new label across the largest and then hunt down the smaller ones on the sides.
Reuse rules
Can I use any box to ship USPS?
Yes, and that includes an Amazon box — new, well-traveled, or still carrying a logo. USPS accepts any box you own, reused ones included, provided the cardboard is strong enough to survive machine sorting and every old logo, barcode, shipping label and address is hidden or blacked out; that instruction sits on usps.com/ship/packages, checked 2026-07-27. Amazon boxes qualify once their markings are gone, and USPS applies the identical test to a box from Target, Walmart or anywhere else — the rule never names a retailer.
Rules read on usps.comLive-priced example boxBuy labels as a guest
The closet box is fine
Sturdy cardboard, hidden barcodes, taped seams. That is the entire entry requirement.
The rules, straight from usps.com
“If you’re reusing a box (be careful: boxes can weaken during shipping), make sure all old logos, barcodes, shipping labels, and addresses are covered or blacked out.” That sentence, per usps.com/ship/packages checked 2026-07-27, is the whole reuse policy in one line.
Taping guidance from the same page: “Use enough 2-inch-wide packing tape to close and secure all seams.” String, cord and twine are named as banned because they snag sorting equipment. Size caps also live there: a parcel maxes out at 130 inches of length plus girth overall, and Priority Mail tightens the ceiling to 108 inches.
What a plain reused carton cost on 2026-07-27
We quoted an 11.8 × 9.8 × 5.9 in box at 2 lb from Newark, NJ 07102 to Atlanta, GA 30303 through the SMKlog calculator. The carrier never learns whether the cardboard is new; these prices apply to any sound box of this size and weight.
| Carrier | Service | Price | Quoted transit |
|---|---|---|---|
| USPS | Ground Advantage | $8.48 | 6-7 business days |
| UPS | Ground Saver | $10.52 | 4 business days |
| UPS | Ground | $11.07 | 3-4 business days |
| FedEx | Ground Economy | $12.42 | 4-5 business days |
| UPS | 3 Day Select | $16.37 | 3-4 business days |
For scale, USPS Notice 123 effective 2026-07-12 lists the retail medium flat-rate box at $24.80. A shipment that genuinely fits a two-pound carton has no business paying that, and the table above is the argument for the box already in your closet.
Prepping an Amazon box for reuse
Re-tape every seam
A box that already made one trip has stressed glue lines. Fresh two-inch tape along the top, the bottom and any split corners brings it back to spec.
Judge the cardboard
Press the walls. Material that flexes like fabric, corners that stay dented, or flaps torn at the hinge disqualify a box no matter how well you tape it.
Old boxes, logos, and boxes from other stores
How old is too old?
USPS's own instruction opens with a caution, not a ban — “boxes can weaken during shipping” — sitting inside the very sentence that gives permission to reuse one, so age alone was never the test. What decides a third-trip Amazon box is the same wall-and-corner check described above: pass it and the box ships like new, fail it and no amount of tape saves it, whether the first trip was last week or last year.
Does the logo have to be covered too?
Yes, by USPS's own wording. The same sentence that names barcodes, shipping labels and addresses also names old logos as something to cover or black out before a box ships again, per usps.com/ship/packages, checked 2026-08-27. A marker or a strip of tape over the printed branding does the job alongside the barcode next to it.
Does the same rule cover Target, Walmart or other store boxes?
Yes, without exception for the brand. USPS's reuse instruction is written around the box, not the retailer whose name is printed on it — sturdy cardboard and covered old markings clear a Target or Walmart box exactly as they clear an Amazon one.
Reused box questions
Can I ship a USPS package in an Amazon box?
Yes. USPS asks only that old logos, barcodes, labels and addresses be hidden or blacked out and that the box remain sturdy, per usps.com/ship/packages, checked 2026-07-27.
Does a reused box cost more to ship?
No. Rate tables never ask where the cardboard came from; they price dimensions, weight, route and speed. Our $8.48 example would cost the same in a fresh carton or a fifth-trip one.
Do I have to use USPS-branded packaging?
Only the flat-rate line requires its own packaging, since those prices are tied to those boxes. Weight-based services, Ground Advantage included, ride in whatever sound carton you supply.
What if an old barcode stays visible?
USPS tells shippers to hide them before mailing. A stray code risks being scanned in place of yours by automated equipment, so a strip of tape and a marker is cheap defense.
Can I use an old or already-shipped Amazon box?
Yes, as long as it passes a sturdiness check. USPS's reuse rule cautions that boxes can weaken with each trip, but it sets no age limit — a box that still holds its shape and takes tape cleanly ships again regardless of how many trips it has made.
Does a box with a visible logo still qualify?
It has to be covered like anything else left from the last trip. USPS's own instruction lists old logos in the same sentence as barcodes, shipping labels and addresses — all of it gets covered or blacked out before the box ships again, per usps.com/ship/packages, checked 2026-08-27.
Does the rule cover boxes from Target, Walmart or other retailers?
Yes. USPS's reuse instruction applies to the box, not the store printed on it, so the same sturdiness-and-covered-markings test clears a Target or Walmart box exactly as it clears an Amazon one.