HIGH-QUALITY HYDRATION BACKPACK - The back lining and shoulder straps are all made of lightweight, breathable mesh nylon fabric, allowing the hydration backpack to keep your back dry and comfortable for outdoor sports. Its double built-in waist straps enhance wear resistance to ensure the backpack lasts longer. 2L WATER BLADDER - It's a great alternative compared to a water bottle. You don't need to carry too many things and make your regular backpack full of bottles when hiking/walking/running. This is very useful for you, it makes you feel less bothered by carrying multiple water bottles and also saves time and energy. COMFORTABLE ADJUSTABLE STRAPS - With soft shoulder straps, the adjustable hydration backpack is suitable for men, women, and children. Wide shoulder strap design with loop for hose adjustment helps you reduce the load and stay comfortable for hours. When you tighten it against your body, you barely notice it's there. EASY TO USE AND WASH - It is easy to fill the bladder with 2 liters of water because the opening is wide. It also makes it easy to clean. The backpack and water bag are separate. You can take the bladder out of the backpack to wash it separately. The backpack is machine washable, but the bladder is not. PERFECT CHOICE FOR OUTDOOR SPORTS AND TRAVEL - Large water bag + portable backpack. Filled with small ice cubes, the bladder keeps you cool for a long time during summer activities and travel. It is a good helper for running, cycling, hiking, climbing, or camping on adventures.