The MSR In-Line Valve is the ideal solution for a leaky problem when you're out on the road! With a low profile, this product is easy to handle and extremely convenient. It is less prone to snagging which makes using it, a hassle-free experience. It presents a great alternative to the ninety degree shut-off valve because it is an in-line valve, meaning that it comes streamlined and is therefore easier to pack. This product is compatible with multiple hydration systems, and it is also an exact fit to the Platypus BigZip SL, Hoser hydration system, and MSR Hydromedary hydration reserves. Fit it snugly inside any pack with the insulated shoulder strap routings, and carry it around with the rest of your stuff without any added bulk. With the MSR In-Line Shut-Off Valve you no longer have to worry about using up precious water unnecessarily in the middle of the wilderness!