Simplify mailing at home or in the office with self-sealing envelopes 24-lb white wove paper offers durability. Features a double-flap design, which prevents the adhesive from sticking before you're ready to mail the envelopes. Just raise the lower flap and press. Quality Park Redi-Seal Envelopes, #10, 4 1/8in. x 9 1/2in., White, Box Of 500 is one of many Business Envelopes available through Office Depot. Made by Quality Park.