Your mail will be secure during transit. We understand how frustrating it can be to stuff your envelope and worry about its safety during transit. Our 10'' x 13'' Peel and Seal Tyvek envelopes easily create a strong seal so your contents are will stay inside the envelope without the need for glue sticks or tape. Durable Tyvek construction is lightweight but extra resistant to tearing, ripping, humidity, water damage, or puncture. Timesaving peel and seal flap creates a strong seal that will easily contain even heavy documents or publications during transit. Save on shipping due to lightweight Tyvek which is half the weight of regular catalog paper mailers. Easily Use for Organized and Secure Storage Easily label the front of the envelope for address labels or to identify stored contents. Wide opening, tear proof Tyvek material, and heavy duty construction allows for storage of many different types of documents or small personal belongings from receipts, photos, or small documents to large reports, company financials, magazines, promotion materials, or tax documents