100ea - Manila Envelopes with Clasp, 4-5/8" X 6 3/4" Width 4 5/8 - Manila Envelopes with Clasp, 4-5/8" X 6-3/4", are made from 28 lb. manila paper. These manila envelopes open on one end with a gummed flap and metal clasp. Manila pouches are good for offices and storing important papers.