Waterproof Outdoor Sports Backpack Shoulder Belt Bag For Biking Cycling Traveling Camping Hiking outdoor travel Hydration Pack Size: Approx. 46 * 20 * 9cm/ 18.11 * 7.87 * 3.54inch Mesh hip fins with two zipped pockets and breathable back system for all-round ventilation. Hydration system compatible with bladder compartment, hook fixing, velcro sealed tube channels. Front zip pocket for extra carrying purpose and string pocket for jacket or helmet. Adjustable shoulder/chest/hip straps meet different requirements for you.