Dimensions of envelope: 12" x 15.5" plus 1.57” lip; Size #4WIDE USE: The mailer bags are popular for soft items, such as clothing, books, CD's/DVD's and other non-fragile items.QUICK EASY PACKING: These poly bags flexible shape allows quick and easy packaging of irregular shaped soft objects. The peel-off strip makes for a quick seal, no licking or water needed to close this bag.WATERPROOF: Protects the contents from water and dust, making them ideal for storage of items.ECONOMICS: The poly mailer bags are a light alternative to cardboard packaging, saving you money on mailing costs.PROVIDES CONFIDENTIALITY: The opaque milky white outer surface and black inner lining ensure the privacy of contents with a professional appearance.OTHER BENEFITS: The poly mailer bags, being tear and puncture resistant, are sealed with pressure sensitive adhesive that provides a high strength, durable closure. Once sealed correctly, the bag must be ripped to be reopened providing visible evidence. These poly mailers don't offer interior cushioning, and are not recommended for fragile and sharp objects.