Material:poly envelopes are made of heavy duty 100% virgin plastic, , poly mailers bags are sturdy and durable. These poly mailers are tear-resistant, puncture-resistant, and waterproof. keep your packages safe until they reach their destination. Size:Usable size 9.8x13.8inches(25x35cm),We care to protect the environment and our postage bags use recycled materials. A great size for sending standard size pillows or smaller decorative pillows or bedding covers as well as large or bulky clothing items like winter coats in the post. Flexible Size:You'll love the size. They're easy to 'size down' by folding to the size of the item and sealing with the built-in adhesive strip. Never worry again about having the right sized box. With these bags, you simply fold and seal. Strong Self Sealing Adhesive Our mailing envelopes is using four-season adhesive, which can maintain strong stickiness throughout the year, even if the weather is very hot or cold. The strong stickiness prevents your items from being secretly replaced during transportation. The adhesive is covered with strip, which are easily peel off the strip and seal the bag. Easy to UseThese poly shipping bags are the perfect choice for small and middle business for easily using with not require extra packaging material, which can improve your company productivity at work, save much time and mailing cost. It is very suitable to transport for hoodies, sweatshirt, clothes, quilt and more.