Zipper closure Thicker PVC material. These clear backpacks are made of odorless thickened clear PVC material that is durable and sturdier than most other backpacks on the market and strong enough for everyday use. It is both heavy and soft, you can fold it as you need, plus it won't crack even in cold weather. Spacious and versatile compartment. Size: 17 x 12 x 7.5 inches (H x L x W). 1 large main compartment for flipchart, laptop, books, lunch, etc., 1 small inner mesh pocket for cell phone, cards, etc., 1 front compartment for pencil case, glasses, etc., 4 mesh slots for pens, tissues, keys, etc., 2 side mesh pockets for water bottle or folding umbrella Wide and comfortable shoulder straps. Reinforced shoulder strap stitching is used to keep the shoulder straps firmly in place. The shoulder straps are specially designed to be wider than usual to reduce the pressure on the shoulders. Each strap is sewn securely and padded for comfort Suitable for all occasions. This clear backpack is perfect for the college and workplace. It provides a quick check of everything you need and easy access useful gift for family and friends. The clear backpack is classic and comes in a variety of colors so you can choose one for the people you care about. It's perfect for their workplace, holidays and any other occasion that calls for a clear backpack.