KUKOME-SHOP 14L Lightweight High Waterproof Backpack for Cycling Hiking Travel Small Sports Daypack Running Hydration Pack Dimesion:45cm*31cm*18cm 14L Rucksack, 2L Bladder (water bladder is not included) Main material: Waterproof Nylon Material; Back Material: 3D Breathable Mesh Outer belt and back of backpack with small storage bags Weight:360g; Lifesaving Whistle included Ideal for cycling, hiking, walking, camping and other sporting activities