Flap-Stik® closure provides a secure, peel-and-press seal. Quality Park™ Reveal N Seal Window Envelope, #10, 4 1/8 x 9 1/2, White, 500/Box. Type: ENVELOPE, large-format-envelopes. Quality Park?. Kraft Coin & Small Parts Envelope, #3, 2 1/2 x 4 1/4, Brown Kraft.