ENVOY Day Backpack Two-tone polyester water repellent Polyester water repellent lining Two-tone Polyester Fabric. Water Repellent YKK Zipper. Duraflex Buckle High Foams Shoulder Strps. Zip Closure Capacity(Volume): 18L Dimension: (W)12.25 x (H) 5.85 x (D) 15.75= (W) 31cm x (H) 40 x (D) 15cm External- One Zipper Pocket, Two H2O Pockets, One Headphone Hole On Shoulder. Interior- One Zipper Pocket, Two Multi-function Pockets, One Laptop Pocket