40L Waterproof Sports Breathable Backpack Outdoor Traveling Camping Hiking Mountaineering Unisex Tactical Climbing Bags Rucksack Specifications: Material: Water-resistant Nylon Package weight: 0.65 kg Package Size(L x W x H): 53.00 x 32.00 x 15 cm Package Contents: 1 x Free Knight FK0216 Backpack Note: 1.water bag is not included, please understand, thanks 2.this model, there is no buckle design for water pipe, please understand, thanks 3.About the outlet part, if you are going to use water bag, you need to cut open it by yourself; if not, just left it as it is, will be ok 4.All the size, is manual measurement, please allow 1-2 cm error, thanks.