WOTOW Tactical Hydration Backpack, Water Rucksack Pack Outdoor Survival Bladder Bag 2.5Liter/85Oz for Camping Hiking TrekkingBiking Running Walking Fit Chest Size 29" - 50" Ergonomically Design, Fit Perfectly --- With adjustable shoulder/chest straps and slidable chest buckle, fit chest sizes from 29" up to 50. The ergonomic design minimizes the bouncing and make user feel light even when fully filled. Large Volume, Leak free --- Includes a 2.5Liter/85Oz BPA free bladder which keeps you hydrated even for a long travel or running. The wide screw cap enable to add ice cubes for a cool drink and keep water leak free after tightly screwed. Lockable Bite Valve, Drink Easy --- Equipped with a lockable bite nozzle on the hose,pull to unlock and push back to lock, ensure water not leak from the mouth. The D shape clasp on both shoulder strap can fix the hose right or left according to personal habit. Durable Fabric, Well Made --- Made of highquality 900D nylon fabric, wear resistant and tear resistant. Integrated with breathable mesh pad in the back, comfortable and not muggy. High Capacity, Multipurpose --- Except the bladder compartment, the packalso includesstorage mesh pocket that will fit your cell phone, keys, wallet, etc... The unique helmet net will be great for helmet, clothes, ropes, etc...