Rating: 4 / 5
This is an excellent, 3-4 oz. lightweight "Camelback like" bladder and drinking tube that can be placed in your pack, in a side pocket, or strapped on top or the back. The hose is approximately 40 inches in length, meaning you can locate it almost anywhere on your person / pack and still reach. It has a clip and very easy to use, with a low leakage valve.
One of the best features with platypus reservoirs is the almost industructable plastic laminate bag. It's much more rugged than the standard "Camelback" bladder, and is IMHO much easier to clean out. It has a very easy to connect / disconnect threaded connector, allowing you to use either the drinking tube or a pull up valve. One other nice feature is the bottom is flat when full, so you can stand it up.
I have 4 of these, and like them much better than any of my other "Camelback" style reservoirs.