9" x 12" Heavyweight Clasp Envelopes are an excellent solution for accessible storage and filing. Whatever your home or office needs are, clasp envelopes make staying organized easier. They're perfect for projects, filing and mailing. Heavy-duty, double-prong clasp and reinforced eyelet are durable enough for repeated use. Envelopes are made of 28 lb. brown Kraft stock that is great for extensive handling and mailing. Contents are protected during use to give you assurance they arrive unharmed. 9" x 12" size accommodates most documents without folding. Opening is on the long side to easily insert and remove documents. Heavy gumming keeps envelopes securely and permanently sealed when needed.