10" x 13" Heavyweight Clasp Envelopes are an excellent solution for accessible storage and filing. Whatever your home or office needs are, clasp envelopes make organizing easier. They're great for projects, filing and mailing. Heavy-duty, double-prong clasp and reinforced eyelet are durable enough for repeated use. 28 lb. gray stock is great for extensive handling and mailing. Contents are protected during use to give you assurance they arrive unharmed. 10" x 13" size accommodates most documents without folding. Heavy gumming keeps envelopes securely and permanently sealed when needed.10" x 13" Heavyweight Clasp Envelopes are an excellent solution for accessible storage and filing. Whatever your home or office needs are, clasp envelopes make organizing easier. They're great for projects, filing and mailing. Heavy-duty, double-prong clasp and reinforced eyelet are durable enough for repeated use. 28 lb. gray stock is great for extensive handling and mailing. Contents are protected during use to give you assurance they arrive unharmed. 10" x 13" size accommodates most documents without folding. Heavy gumming keeps envelopes securely and permanently sealed when needed.