Everything about the Platypus GravityWorks water filter makes purchasing it a no-brainer for me. As long as you have a water source and gravity, it's going to work for you. After finding a camping site I simply fill the dirty bag with water and set it up to filter into the clean bag. Well before having my tent set up I've got 4 liters of cold, clean, bacteria-free water waiting for me and I didn't have to pump anything! As long as you follow the back-flushing instructions after use (simple), the filter should last up to 1500 liters. So cool.