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