What are the different types of trays and sacks that a mailing must go into, which one(s) do I need, and where do I get them?
Letter sized mail normally goes into, what the Post Office calls, a one-foot or two-foot MM trays. If your letter is oversized (greater than 10″ wide or greater than 4 5/8″ high), then these letters will go into EMM trays. Large non-letter sized pieces, such as 81/2″ X 11″ envelopes, are referred to as flats. Standard (A) flats go into white canvas or plastic Sacks and First Class flats go into Flat Trays, also called First Class Flat Tubs. You can pick any of these up at the Post Office where you will be dropping off your mailing along with any other supplies that you may need to package your mailing such as rubber bands, tray sleeves, etc. If you want to know exactly how many and what type of trays or sacks you will need for your mailing, do the sort of your mailing list and then print out the Postage Statement which will have the quantity and type of trays or sacks needed for the mailing. You can then pick these up from the Post Office before printing your labels and packaging your
