This Outdoor Products Trail Break Hydration Pack is ideal for camping, hiking, or trekking. It includes a 3 liter BPA-Free hydration reservoir to keep you hydrated when you need it. The hydration bladder features a bite valve with on/off valve to keep the bite valve from leaking. This 18-liter green unisex backpack features a unique routing system which allows the hose to route thru the shoulder strap. It will hold the Outdoor Products 2 liter or Grande 3L Replacement Bladders. (2L Bladder not included and sold separately). The front stash pocket is expandable to hold all our additional gear that you may need to bring along. The stowable rain cover is easily accessible to protect your pack when you are out in the elements. This 9.2" x 5.7" backpack is suitable for a senior, adult, teen and kids.