Measure the box you sealed
Rates are quoted on the carton, not the contents. Bubble wrap and a generous carton can move a parcel into a higher cell than the object ever justified.
A lower price on an online label is not a promotion, a membership perk or a bulk deal you have to earn. It comes from a separate published column in the USPS price list, and from letting three carriers price the same box at once instead of accepting the first figure offered. On 2026-07-28 a 15 lb carton from Newark to Atlanta quoted $17.01 against the $28.95 counter figure the carrier returned with it.
Nothing about the cheaper label changes the network. It changes which published price the label came from.
None of them are a discount code. They are structural, and they are all checkable.
There is a fourth thing that is not on the list, and its absence is the point: no coupon, no referral code, no minimum volume, no negotiated agreement.
These are the sort of things small sellers actually post. Each was quoted through our calculator on 2026-07-28 from Newark, NJ 07102 to Atlanta, GA 30303, and the counter figure column holds what the carrier returned for the same parcel alongside its own price.
| Parcel | Box and weight | Carrier and service | Counter figure | Price paid |
|---|---|---|---|---|
| Paperback book | 8 x 5 x 1.5 in, 1 lb | USPS Ground Advantage | $10.95 | $9.91 |
| T-shirt in a mailer | 12 x 9 x 1 in, 0.7 lb | USPS Ground Advantage | $10.95 | $8.86 |
| Phone in a padded envelope | 9 x 6 x 1.5 in, 0.6 lb | USPS Ground Advantage | $10.95 | $8.86 |
| Coffee mug | 6 x 5 x 5 in, 2 lb | USPS Ground Advantage | $14.95 | $8.48 |
| Sealed carton | 12 x 12 x 12 in, 15 lb | USPS Ground Advantage | $28.95 | $17.01 |
| Larger carton | 20 x 16 x 12 in, 25 lb | FedEx Ground Economy | $41.32 | $28.77 |
The mug is the one that surprises people. It weighs over three times what the phone envelope weighs and costs 38 cents less, because a compact 6 x 5 x 5 in box at 2 lb lands in a kinder cell of the grid than a long thin envelope does.
The bottom row also shows the limits of loyalty to one carrier. USPS won five of these six parcels and lost the heaviest to FedEx Ground Economy by a clear margin.
Worth saying plainly, because the search results around this topic are full of implications that never quite become claims.
Carriers can still re-measure a parcel after collection and bill the difference. That is a real risk on any label from any source, and the way to avoid it is to measure the finished box rather than the object inside it.
Rates are quoted on the carton, not the contents. Bubble wrap and a generous carton can move a parcel into a higher cell than the object ever justified.
Two boxes on the shelf can be a few dollars apart on the same shipment. It costs nothing to price the shipment twice before taping anything.
USPS took five of the six parcels above and lost the sixth. Re-run the comparison per shipment rather than settling on a favourite carrier.
Two published places. USPS prints a commercial column in Notice 123 that sits under the retail column at every weight and zone we checked, and buying electronically lets you see USPS, UPS and FedEx price the same box side by side rather than taking the first number offered.
Yes. Same carrier, same network, same tracking, same scan events at the same facilities. The only difference is which published price the label was bought from and where it came out of a printer.
On six parcels quoted from Newark to Atlanta on 2026-07-28, a 2 lb coffee mug came to $8.48 against a $14.95 counter figure, and a 15 lb carton to $17.01 against $28.95. Light parcels show the narrowest gap and heavy ones the widest.
No. Buying a single label needs no account and no plan, and what the paid plans add is set out on our pricing page. We sell US domestic parcel labels only, so international shipping, fulfillment and platform integrations are not part of it.