Flap Envelope Flap envelopes secure contents and give an impressive professional look. These sturdy envelopes can be easily customized with add-on features such as printing, colored vinyl, Velcro® or brass snap fasteners. Long Side Opening Flap envelopes secure contents and give an impressive professional look. These sturdy envelopes can be easily customized with add-on features such as printing, colored vinyl, Velcro® or brass snap fasteners. Order Now Quantity/Price Each Stock No. Overall Size (in) Insert Size (in) Gauge 100+ 200+ 500+ 1000+ 2000+ 5000+ 45058L 8 1⁄2 × 5 1⁄2 8 1⁄8 × 5 1⁄8 0.010 0.74 0.68 0.63 0.58 0.54 Contact us for better pricing! 45069L 9 1⁄2 × 6 1⁄2 9 1⁄4 × 6 1⁄4 0.010 0.77 0.71 0.66 0.61 0.57 Contact us for better pricing! 45092L 12 × 9 1⁄2 11 5⁄8 × 9 1⁄4 0.010 1.02 0.96 0.91 0.86 0.82 Contact us for better pricing! 45103L 13 × 10 12 1⁄2 × 9 1⁄2 0.010 1.08 1.02 0.97 0.92 0.88 Contact us for better pricing! Custom Custom Contact us for custom sizes!