Thick and not bendable. That is determined by the size of the piece, not by what it contains. Make sure you know whether your mail piece is a postcard, letter, a flat, or a parcel. Hello When mailing it yourself from a machine, etc., do you treat a bubble or padded envelope as a package or as an envelope? Minimum size: 3 1/2 inches tall x 5 inches long and 0.007 inches thick Maximum size: 6 1/8 inches tall x 11 1/2 inches long and 1/4 inches thick Maximum weight: 3.5 oz. 1 decade ago. would it cost $0.44 or $0.88 to mail. Answer Save. Want an in-depth look at popular envelope products? I can't really call these "rigid" which seems to be a USPS term as part of the qualifications. Relevance? The USPS ® site contains the current physical standards and sizes for letters, parcels, and flats. It’s only a flat if it’s “machinable” – i.e. Business envelopes are widely used for direct mail and transactional mail (e.g., monthly statements or bills). If you’re sending books in large envelopes, they are considered parcels. When a piece of First-Class Mail exceeds any one of the maximum measurements of a letter, it is classified and priced as a large envelope (flat). First-class letter is the least expensive, and large envelope/flat is in the middle. Domestic Quick Reference Guide and Flat Rates for Domestic; Quick Reference for International Prices and International Flats. There is no "Large package" category within First Class. Is a 6 x 9 envelope considered a letter envelope or a flat envelope? Aspect ratio: Length divided by height: Ratio must be between 1.3 and 2.5 or the letter will be subject to a non-machinable surcharge. Thanks Yes, a flat is a large envelope. Standard US envelopes sizes are listed here. Find standard envelope sizes, name and dimensions -- Assistance to help choose the correct envelope for your project - Envelopes have many sizes and may cause confusion. If over 1/4" and lumpy or rigid, then it is a Parcel. If so, then it is a Flat/Large Envelope. Envelope size chart. See step 3 for details. But if a large envelope is thick or rigid, it is considered a parcel. The maximum weight for letter-size pieces is 3.5 ounces. The maximum size for letters did not change: 11-1/2" x 6-1/8" x 1/4" thick. If less than 1/4" thick, a 6x9 would still be classified as a Letter. I'm talking about very small contents and almost flat. If over 1/4", then it depends on if the package is uniform in thickness & flexible. I agree with the 6X9 envelope. Favorite Answer. First Class Letter. The difference in the postage is significance depending. USPS Postage Price Calculator is a free online tool that allows you: Calculate Postcard price; View Flat Rate Envelopes Lv 7. For example, a 9 x 12 envelope containing a letter is considered a "flat" because of its size, while a 5 x 8 card is considered a "letter", even though most of us would call it a postcard. It is small enough to still qualify as a “letter”. In any case, if it is greater than 3/4" at any point, it is a Parcel. Business Envelopes for Direct and Transactional Mail Sizes. able to bend and go thru the processing machinery like a letter. A #10 envelope is the popular business envelope size, and is used for both direct mail and transactional mail. 3 Answers. The cost will be 44 cents as long as it is within the weight restrictions. If a bit larger, it would be a “flat” and would require more postage. First Class pieces are categorized as letters, flats (AKA Large envelope), or packages/parcels (which includes any piece over 3/4 inch thick). If your goal is to send a package with a tracking number, your only option is to ship it by first-class parcel. Envelope Help is here. Small enough to still qualify as a “ flat ” and would require more postage flat envelope domestic Quick... Flat/Large envelope letter, a flat, or a parcel site contains the current physical and... 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