Can i use forever stamps on a bubble mailer

Forever stamps are designed for use on standard-sized, rectangular envelopes weighing up to 1 ounce. Bubble mailers, on the other hand, are typically larger and more irregularly shaped, which can affect the postage required.

The United States Postal Service (USPS) has specific guidelines for mailing items in bubble mailers:

Forever stamps are not valid for use on bubble mailers because they are not designed for use on items that exceed the standard envelope size or weight. Using a Forever stamp on a bubble mailer could result in additional postage being required, and you may be subject to fines or penalties if you're caught.

To avoid any issues, it's best to use the correct postage for your bubble mailer based on its size and weight. You can use the USPS Postage Calculator or consult with a postal worker to determine the correct postage for your specific item.