If the 5×7 envelope weighs one ounce or less then a forever stamp should be sufficient. For the 1st oz use one Forever stamp. if you envelope exceeds 1 OZ the you must add more Forever stamps to cover the extra weight.

Country Conditions for Mailing – Finland

A rectangular 5×7 envelope is the standard size that is used in the United States for mailing letters and invitations, so if your envelopes are within the weight range of 1 oz, then you will only need to pay $. 47 for each one without any additional charge.

If your bubble mailer is considered an envelope and weighs 1 ounce or less, you can slap a $0.55 forever stamp on your mailer and drop it off at your post office as usual. Use USPS First Class if your bubble mailer weighs under 16 ounces and you are shipping a personal item.

Assuming that you’re too thick due to bubble rap, it’s $3.50 before adding any additional services for standard First Class mail. At current “forever” value of $0.50 – that means 7 stamps. First of all, any item weighing more than 3.5 ounces is in the large envelope category.

Assuming that you’re too thick due to bubble rap, it’s $3.50 before adding any additional services for standard First Class mail. At current “forever” value of $0.50 – that means 7 stamps.

And taped it well? Poly bubble mailers with extra bubble wrap inside are more secure than the kraft ones. Kraft ones get brittle and tape fails, or they can easily get wet and contents be damaged. And, yes, put it in the mailbox.

USPS Rate Changes 2021