Sizes for Letters You probably have a picture in your mind of what a "letter" is. Possibly you're using a standard No. 10 envelope for your letter, so that's easy to picture.

Sizes for Large Envelopes and Flats The Postal Service uses the word "flats" to refer to large envelopes, newsletters, and magazines. The words large envelopes and flats are used …

What Are You Mailing? Domestic Knowing the shape of your mail determines the price you will pay.

Minimum and Maximum Sizes Minimum Sizes If a mailpiece is 1/4 inch thick or less, it MUST be rectangular and at least 3-1/2 inches high by 5 inches long. All mailpieces MUST be at least …

Except for USPS Retail Ground and Parcel Select, no mailpiece may measure more than 108 inches in length and girth combined. Length is the measurement of the longest dimension and …

Nov 4, 2024 · For all letter-size and flat-size mail in window envelopes, every character in the delivery address, including any postal barcode, marking, or endorsement, must be completely …

Mailpieces larger than any of those dimensions and you'll have to pay flats (large envelope) postage prices. Some mailers want to attach stickers, magnets, or other items to their postcards.

Minimum: 5 inches long, 3-1/2 inches high, and 0.007 inch thick. For letter-size pieces 0.009 inch thick if more than 4-1/4 inches high or 6 inches long, or both.

• Do not use a window envelope, an envelope that is less than 1 inch higher than the label, an envelope that is more than 4-1/2 inches high, or an envelope with any printing other than a …

On all First-Class Mail, Periodicals, USPS Marketing Mail, and Bound Printed Matter flat-size pieces mailed at presorted, automation, or carrier route prices, mailers must print the delivery …