Quality Park™ Redi Seal Envelope, Security, #10, 4 1/8 x 9 1/2, White, 500/Box. Color: Brown, Kraft. Quality Park™ High Bulk Self Sealing Envelopes, 9 x 12, Kraft, 100 per box. Quality Park?. Brown Recycled Kraft String & Button Interoffice Envelope, 10 x 13.