Other Catalog Envelopes from Blue Summit Supplies. Peel & Seal Flap ✔ ✔ ✔ ✔ ✔ ✔. Size 6″ x 9″ 7″ x 10″ 9″ x 12″ 10″ x 15″ 11.5″ x 14.5″ 13″ x 18″. Security Tint ✘ ✔ ✘ ✔ ✘ ✔.