Vorspack Clear Backpack Heavy Duty PVC Transparent Backpack | GreenVorspack Clear Backpack Heavy Duty PVC Transparent Backpack Green Zipper closure Thicker durable PVC: The clear backpack is made of smell less thicker PVC material; much more durable for everyday use than most backpacks on the market; It is both durable and soft that you can bend it as you need; and it would not crack even in cold weather Reinforced strap stitches: Reinforced cross stitches are adopted to fix the strap firmly; The shoulder straps are