I have a Sawyer 4 Liter Bag to Bag Water Filtration System for sale. I have used it once (in the home kitchen) checking it out. I ran only 4 liters of city water through it and I can guarantee that it is 100 % as new as can be. Never used outdoors and in the the original carton. This Is the model with the levers valves on both bags. Can send photos of all sides if pm'd a request. $95, plus shipping.