Inexpensive white mylar stock envelopes have multiple uses, including organizing stamps and storing them. Resistant to air and water, contains no harmful chemicals. 50 envelopes per package. 4 ¼" x 2 ¾" sized envelopes.
#4 Glassine Envelopes
27x30mm 50 Vertical Black Split-Back Mounts
#2 Glassine Envelopes
45x30mm 50 Horizontal Black Split-Back Mounts
30x45mm 50 Vertical Black Split-Back Mounts
Gray Mylar Envelopes Blank, Package of 50
30x34mm 50 Vertical Black Split-Back Mounts
30x27mm 50 Horizontal Black Split-Back Mounts
Mystic Blank Supplement, Package of 24 Pages with Border 1-Side Only