Square flap envelopes made from a super strength crystal clear material with a peel-away adhesive strip for self-sealing.  Acid free.

Sizes and Flap (Opening) Positions

Business Card (2 1/2" x 3 9/16") -- 3 9/16" Opening
Bookmark (2 1/4" x 8 1/2") -- 2 1/4" Opening
Trading Card (2 15/16" x 3 3/4") -- 2 15/16" Opening
Trading Card (4 1/16" x 2 3/4") -- 4 1/16" Opening
3 1/4" x 4 1/8" -- 4 1/8" Opening
#4 Baronial (3 13/16" x 5 3/16") -- 3 13/16" Opening
Postcard (4 1/4" x 6 1/8") -- 4 1/4" Opening
#5½ / A-2 (4 1/2" x 5 7/8") -- 5 7/8" Opening
#6 / A-6 (5" x 6 13/16") -- 6 13/16" Opening
#7 / A-7 (5 1/4" x 7 7/16") -- 7 7/16" Opening
#8 / A-8 (5 5/8" x 8 1/4") -- 5 5/8" Opening
#9 / A-9 (5 15/16" x 8 3/4") -- 5 15/16" Opening
#10 Business (4 5/16" x 9 3/4") -- 4 5/16" Opening
6 1/4" x 9 1/4" -- 9 1/4" Opening
8 7/16" x 10 1/4" -- 8 7/16" Opening
Letter Size (8 15/16" x 11 1/4") -- 8 15/16" Opening
9" x 12" -- 9" Opening
9 1/4" x 12 1/4" -- 9 1/4" Opening
10" x 13" -- 10" Opening
11 1/4" x 14 1/8" -- 11 1/4" Opening
11 1/4" x 17 1/4" -- 11 1/4" Opening