Quality Park catalog mailing envelopes are perfect for shipping, storing or organizing. Heavyweight 28 lb. kraft paper withstands extensive handling at home, in the office or on the mail route. This classic open end envelope is versatile. Stores letter-size documents and photographs flat or larger items folded. These large envelopes (9 x 12) are perfect for workbooks, manuscripts, booklets, sales literature, certificates, contracts or other large or heavy enclosures. A wide, heavily gummed commercial flap seals tight with moisture to keep bulky inserts secure. Business envelopes with center seams give added strength for heavy contents. Use as shipping envelopes or to sort and organize home schooling materials, home office projects, and more. Store your Quality Park gummed catalog envelopes in a cool, dry place for impressive longevity. Stock up! There are always more uses than envelopes. 100 per Box.