ENVOY Classic Backpack Medium Size 100% polyester water repellent Polyester water repellent lining Polyester Fabric. Water Repellent YKK Zipper. Duraflex Buckle High Foams Shoulder Straps. Zip Closure Capacity(Volume): 28L Dimension: (W) 13 x (H) 17.7 x (D) 7.5 = (W) 33cm x (H) 45cm x (D) 19cm External- One Zipper Pocket, Two Side Pockets(Load an Umbrella and a Water Bottle), One Headphone Hole On Shoulder. Interior- One Zipper Pocket, Two Multi-function Pockets, One Laptop Pocket