ShopIcolorGifts Lot of 100 New Westvaco Glassine Envelope Variety Pack Size #1, 2, 3, 4 and #5. 20 of Each Size 20 of Each Size Envelopes: Size #1, Size #2, Size #3, Size #4 and Size #5 Acid- free and PH neutral suitable for archival quality. Useful for Stamp Collectors. Translucent (semi-clear) in color The envelopes feature two side seam