How Many Stamps Do I Need for a Manila Envelope (USPS)
https://postagemaster.com/how-many-stamps-do-i-need-for-a-manila-envelope-usps/
WEBThe number of stamps required for a Manila envelope depends on factors like weight, size, and destination. For standard-sized letters weighing 3.5 ounces or less, one stamp is sufficient. However, for large envelopes such as 9×12, legal, and Manila envelopes, two stamps are needed for the first ounce, with an additional $0.20 charge for every ...
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