If your large envelope exceeds 15 inches x 12 inches x 3/4 inch thick it is considered a parcel and priced accordingly (cost a little more). This is because it needs to run through a AFSM Flat sorter machine, which only allows for a certain thickness. Large envelopes need to have some flexibility to them and cannot be more than 3/4 of an inch thick. Do First Class Flats Have to Be Flexible? This means you can’t use a drop box for anything over 13 ounces. The reason is to stop people from mailing malicious items because postage stamps are not able to be tracked to the person who mailed a package. You should be aware that if you are mailing any item letter, flat, or parcel that has stamps on it you MUST bring it into a post office and visit the counter to be mailed. Large Envelopes (flats) that are larger than the max dimensions, are rigid, non-rectangular, or not consistently thick, are charged parcel prices. This is what is called a first class flat. The max size of a flat is 12 inches x 15 inches x 2.5 inch thick. What is the Maximum Size of a First Class Flat? If you that go over these dimensions or it weighs more than 3.5 ounces, it gets a rate as a flat (costs a little more). Something this size would be considered a standard envelope.

The max size is 11 ½ inches x 6 1/8 inches x 1/4 inch thick. What is the Maximum Size of an Envelope for First Class Mail? If you are buying postage stamps at a local retailer you are probably not going to bother having it weighed and so how many stamps do you need per ounce may not matter to you. For others you’ll want to all pay for the weight you are sending. For some throwing on two stamps and eating the couple extra cents you will pay is probably no big deal. My best advice is to have it weighed at the postal service so that you don’t overpay for postage. If it is you are subject to pay additional postage. Do Greeting Cards Weighing More Than Ounce Need More Than One Forever Stamp? These stamps are of course available at your local post office, but there are other retail locations that sell Forever stamps. You can find other pictures on them such as fireworks, flowers, the Statue of Liberty, the Liberty Bell, and some seasonal choices like a snowflake. The three most popular forever stamp products are the American flag, the purple heart, and Love (a must have for wedding invites). If you want an idea of how much one ounce is, its equivalent to a pair of standard dice. If you only are using one to mail a letter, the total weight of the letter, envelope, and stamp, cannot exceed one ounce. For example if you bought one 2013 for $0.41, you can still use it in 2019 despite the fact postage costs more. So when it comes to how many stamps do you need per ounce, it is not a 1:1 stamp per ounce ratio.Ī Forever Stamp is a non-denominational first class stamp that guarantees its usage no matter what the current price of postage is. You technically can just put multiple Forever stamps on an envelope, but you would most likely be over paying for postage if for example your envelope only weighed two ounces. For each additional ounce you would need an additional $0.21 of postage. One Forever stamp can be placed on an envelope weighing nor more than one ounce.

Self addressed stamped envelope weight