Features1The backpack is equipped with a built-in water bladder compartment, freeing up your hands. Riders can replenish their hydration in a timely manner while riding. 2The breathable mesh back panel is more comfortable to wear and reduces the burden of exercise. 3It is compact and low-profile, providing a light and stable feel on your back while minimizing wind resistance. 4The backpack adopts a breathable mesh design, which can quickly dissipate sweat and heat. 5This hydration backpack is suitable for hiking, running, mountaineering and outdoors.SpecificationDuring a long hike having water so convenient and still coldtheres nothing like it. Lightweight with a custom fit, youll forget you have it on until you need it. This hydration pack give you plenty of water for your day hike.Features:The backpack is equipped with a built-in water bladder compartment, freeing up your hands. Riders can replenish their hydration in a timely manner while riding.The breathable mesh back panel is more comfortable to wear and reduces the burden of exercise.It is compact and low-profile, providing a light and stable feel on your back while minimizing wind resistance.The backpack adopts a breathable mesh design, which can quickly dissipate sweat and heat.This hydration backpack is suitable for hiking, running, mountaineering and outdoors.Specifications:Material: NylonColor: Green/ Blue/ Black/ Red (optional)Size: 43*27*6cm/ 16.9*10.6*2.4inWeight: 300g/ 10.6ozPackage list:1 * hydration backpackPackage List1 * hydration backpack