Last reviewed: August 25, 2026. Postal prices can change; verify unusual pieces with USPS before mailing.
Yes. Genuine, unused Forever stamps can be affixed to a package as postage. Each regular Forever stamp contributes $0.82 in 2026, but a stamp does not turn a parcel into First-Class Mail. You must select an eligible package service and cover the complete price, including any dimensional or other applicable charges.
The rule that matters
USPS mailing standards allow adhesive stamps as a postage-payment method for eligible retail mail. The total face or current value affixed must equal at least the required postage. Package prices are not a simple “ounces times stamps” calculation: mail class, weight, dimensions, distance zone, and surcharges can all matter.
That is why there is no reliable universal answer such as “four stamps for every small package.” First calculate the package price, then divide that amount by the current $0.82 Forever value and round up if you intend to use only whole regular Forever stamps.
Example calculation
Suppose the correct retail price shown by USPS is $6.85. Eight regular Forever stamps are worth $6.56 and are short. Nine are worth $7.38 and cover the price, with $0.53 overpayment. Mixing denominations or buying a label for the exact amount avoids that waste.
Use our Forever stamp calculator for the arithmetic after you know the correct price. The calculator does not determine parcel zones or special handling, so obtain the actual package rate from USPS first.
When an “envelope” becomes a package
A padded mailer, rigid photo envelope, or lumpy large envelope can be classified as a parcel even when it looks like paper mail. A qualifying flat must meet flexibility and uniform-thickness rules. If it does not, package rates can apply. Our large-envelope guide explains that boundary.
Practical steps
- Pack and seal the item before measuring.
- Weigh it on a scale that is accurate for the package.
- Measure all dimensions, including thickness and any bulge.
- Enter the origin and destination ZIP Codes in the official USPS calculator or ask at a Post Office.
- Select the eligible service and include every surcharge.
- Affix enough valid postage, keeping stamps flat and unobscured.
Can a package with stamps go in a collection box?
Do not assume every stamped package may be dropped anonymously into a collection box. USPS has acceptance and security rules for mailpieces bearing only stamps, and some pieces must be presented to a retail employee. The safest approach—especially for a heavy, thick, international, or high-value parcel—is to take it to the counter.
Forever stamps versus a shipping label
| Method | Useful when | Trade-off |
|---|---|---|
| Forever stamps | You already own valid stamps and know the exact rate | Easy to overpay; no service information is printed |
| Mixed-denomination stamps | You want to pay closer to the exact amount | Still requires correct classification and rate |
| USPS label or counter postage | Zone, dimensions, tracking, or acceptance rules matter | Requires an online calculation or counter visit |
Using several stamps is allowed; see how multiple Forever stamps combine. If stamps came from an unfamiliar discount seller, check our counterfeit-stamp warning signs before relying on them.
Frequently asked questions
Can I use Forever stamps on a bubble mailer?
Yes, if the stamps cover the full price for the mailer’s actual classification. Most bubble mailers are treated as parcels rather than letters.
Do Forever stamps include tracking?
No. A stamp pays postage value; it does not by itself purchase a tracking service. Tracking availability depends on the mail class and extra services selected.
Can I use old Forever stamps on a package?
Yes, genuine unused regular Forever stamps retain the current domestic one-ounce letter value and can be combined toward eligible postage.