9.25" x 11.75" Stay Flat Envelope

The 9.25 x 11.75 stay flat envelope sits in the sweet spot between snug and roomy: large enough that 8.5 x 11 letter size paper drops in with margin to spare, small enough that contents do not shift around or bend in transit. This 9.25 x 11.75 rigid mailer is built from 420 GSM heavy duty cardboard that refuses to crease through carrier sorting machines, rough handling or weather, and the white, label-ready finish takes ink, stamps and shipping labels cleanly.

The 9.21 by 11.71 inch inner dimensions are intentional. They leave just enough room for 8.5 x 11 documents, certificates, transcripts or thin booklets to sit flat with protection on all four sides, without the loose space that lets contents slide and fold during transit. The 1.97 inch flap folds back fully for fast loading, and the self-adhesive seal strip closes each 9.25 x 11.75 stay flat envelope in seconds without reaching for tape or scissors. A built-in tear strip on the back gives recipients a clean opening, which keeps your unboxing experience consistent across orders.

This is the envelope offices, registrars, HR teams and schools reach for when shipping diplomas, transcripts, signed offer letters, certificates and legal documents that need to look as professional as they did the moment they left the printer. It also works well for photographers shipping 8 x 10 portrait prints with a protective interleaf, and for print shops fulfilling letter size print runs. Every pack ships with 200 free Do Not Bend stickers, the cardboard is fully recyclable, and bulk pack sizes are priced to make this 9.25 x 11.75 rigid mailer affordable for high volume document shipping.

• Sized with margin around 8.5 x 11 letter documents, certificates and transcripts for protection on all sides
• Heavy duty 420 GSM cardboard keeps documents perfectly flat through carrier handling
• 200 free Do Not Bend stickers included in every pack for carrier visibility
• Self-adhesive peel and seal strip closes each mailer in seconds, no tape needed
• Built-in tear strip on the back gives recipients a clean, damage-free unboxing

• Schools, universities and registrars mailing diplomas, transcripts and academic certificates
• HR teams shipping signed offer letters, employment contracts and confidential documents
• Law firms and offices mailing 8.5 x 11 legal documents and signed agreements
• Print shops fulfilling letter size certificate orders and document print runs
• Photographers shipping 8 x 10 portrait prints with interleaf protection