30ct 6" x 9" Press and Seal Envelopes White - up&up™: Self-Seal Mailing, Paper, Gummed Flap, Size 9, 30 Pack

A: 6x9 envelopes meet First-Class letter size requirements. The size is less than the minimum 6⅛ inches by 11½ inches for a First-Class Mail Flat (large envelope). Below is an USPS Help excerpt from Article 000003138 dated Oct 25, 2021 for First-Class Mail Letters mail USA domestic. First-Class Mail Letters Price paid on a per ounce basis – based on First-Class Mail stamp price Maximum Weight: 3.5 ounces – Additional ounces above one ounce have a separate per ounce price Size Requirements: Minimum Size: 3½ inches by 5 inches Maximum Size: 6⅛ inches by 11½ inches Thickness: 0.009 inch to ¼ inch Pieces that do not meet the minimum dimensions are nonmailable Letters that do not meet certain size and shape requirements may also be charged a separate Nonmachinable Surcharge Pieces that exceed the maximum dimensions or weight are priced as Flat (Large Envelope) mailpiece

A: This is considered a large envelope by the USPS. One Forever stamp will NOT be enough to send it. You'll need to fill it and take it to the P.O. for them to measure and weigh it. Keep it under 1/2 inch thickness and not rigid, and it can sneak through at the cheaper large envelope rate. (More than 1/2 inch and rigid, and it has to go as a package.)

A: Hi JunieDear – Thanks for viewing our press and seal envelopes! I love that these are sealed with a self-adhesive closure. You’ll need to fill one up and go to the Post Office to see how many stamps you’ll need. Thanks for dropping by. - Anita