Ortlieb Water-sack

"The ORTLIEB water bag ensures that water can be supplied without bulky canisters, even at camp. It can be rolled up small on the go. Once unpacked, this space-saving wonder made of tear-resistant, waterproof fabric offers sufficient volume for cooking, washing up and even showering. The large opening at the top with roll-top closure makes refilling easy. The valve system integrated in the base allows the pouring volume to be optimally dosed. Equipped with the Katadyn siphon filter (not included), it is also perfect for treating drinking water."