22.1: Envelope Fundamentals
- Page ID
- 180481
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Use an envelope appropriate for the size and type of correspondence when prepared for dispatch. The envelope should be rectangular and the correspondence should fit easily, but not too loose, so use an envelope that is only slightly larger than the dispatch-ready correspondence. When choosing an envelope size, be aware that very small and very large envelopes are difficult to process: Normally, use envelopes at least \(3.5\) by 5 inches and no larger than \(6.125 \times 11.5\) inches. In addition to the size of the envelope, consider the following when selecting an envelope:
- When using window envelopes, be sure that the MEMORANDUM FOR element is visible through the envelope window.
- When several items are to be dispatched together, the largest item that cannot be folded determines the envelope size.
- Do not use envelopes with clasps, staples, string buttons, or similar securing devices for USPS mail-they will jam in the automated mail sorting equipment.
- Limit the thickness of any envelope to \(1 / 4\) inch or less when sealed-thicker envelopes will jam the automated mail sorting equipment. Write "NON-MACHINEABLE" above the address on any envelope if it is more than \(1 / 4\) inch thick.