Glassine envelopes are highly appreciated in stamp collecting for storage purposes. They are also useful in photography, and many other areas. All of our glassine envelopes are excellent quality and acid free. They are made from the best, transparent virgin 30# glassine to assure maximum visibility. We have 11 different sizes for you to choose from, in packs of 100 or boxes of 1000. These envelopes are what we use to store our stamps.