![]() None of the USPS shipping supplies qualify for USPS First Class Package Service. Keep in mind that you must use your own plain or branded packaging. You can ship a box, poly mailer, or envelope via USPS First Class Package Service. READ: Where do the Four Corners meet? Can I use my own envelope for USPS First Class? This applies not when the bubble mailer is empty, but when the contents of your shipment are inside. USPS will only accept bubble mailers as packages if their total thickness is 3/4 of an inch or more. Is a bubble mailer an envelope or a package?īubble Mailers and Envelopes are Considered Packages When They’re 3/4 Inches Thick or More. There is no maximum thickness for Flat Rate Envelopes. How thick can a priority mail envelope be?Īs long as the envelope closes within the normal folds, bulges will not matter.
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