I've always hated pumping water. For a while, I toyed around with the idea of using a gravity filter but they all seemed to heavy for what they were. Then, after I discovered the Aquamira Frontier Pro, I had an idea to make an ultralight filter system that could be used both as a gravity filter and on the trail as a filter-as-you-go hydration system. The result was a sub-five ounce system that I'm really happy with. This will be my go to UL filter for long trips.