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Can You Use Forever Stamps on a Bubble Mailer?

Forever stamps can count toward bubble mailer postage, but one or two may not be enough. Learn when flat or package postage applies.

Direct answer

Yes, Forever stamps can be used as postage value on a bubble mailer, but one stamp is rarely enough and two may still be short. A current Forever stamp is worth $0.78; a 1-ounce flat starts at $1.63, and many bubble mailers are packages that need package-level postage. Count the mailer class and weight first, then add enough postage or buy exact postage.

required postage - stamp value already applied = remaining postage due

Forever stamps on bubble mailers

Thin flexible mailer under flat rules

One stamp is not enough at current flat start

Use at least the full flat postage

Two Forever stamps

$1.56 total at current value

Still below the $1.63 1-ounce flat example

Rigid or lumpy mailer

Letter or flat stamp math may fail

Buy package postage

Heavier mailer

More stamps may be needed

Weigh it before mailing

Tracking needed

Stamps alone may not provide it

Use a package label or retail counter

Bubble mailer situation	Stamp takeaway	Safer action
Thin flexible mailer under flat rules	One stamp is not enough at current flat start	Use at least the full flat postage
Two Forever stamps	$1.56 total at current value	Still below the $1.63 1-ounce flat example
Rigid or lumpy mailer	Letter or flat stamp math may fail	Buy package postage
Heavier mailer	More stamps may be needed	Weigh it before mailing
Tracking needed	Stamps alone may not provide it	Use a package label or retail counter

Stamps are value, not a category override

A Forever stamp contributes the current 1-ounce letter rate toward postage. It does not make a bubble mailer a letter, and it does not remove package-price requirements when the finished mailer is rigid, lumpy, or nonuniform.

Use stamps without underpaying

1Decide whether the packed bubble mailer is a letter, flat, or package.
2Weigh the sealed mailer.
3Look up the current postage for that class and weight.
4Multiply current Forever stamp value by the number of stamps you plan to use.
5Add exact postage or buy a label if the stamp value is short.

FAQ

Can I put two Forever stamps on a bubble mailer?

You can use Forever stamps as postage value, but two stamps are not a reliable rule. Two current Forever stamps equal $1.56, which is still below the current $1.63 starting price for a 1-ounce flat and far below many package prices.

Will USPS return a bubble mailer with not enough postage?

It may be returned, delayed, or delivered with postage due. The risk is higher when the mailer should have been priced as a package or when the stamp total does not cover the required postage.

Do bubble mailers need package labels instead of stamps?

A package-class bubble mailer often needs package-level postage and may be easier to handle with a printed label, especially if tracking or online postage is involved. The key issue is paying the correct class and amount.

Sources & method

We reviewed these references while writing this answer. Figures are estimates — confirm safety-critical work with a professional. Last updated June 7, 2026.