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3L Gravity Filtration: 3L water reservoir can be connected to the water filter for gravity water filtration. 3L collapsible water tank can be connected to another side of the water filter. The whole filtration system can be connected inline. You can walk away while the water filtered. It is unnecessary to watch it to make sure that it is going to overfill the water container. 3L = 0.79gallons.
1L Attachable Collapsible Bottles: Threads on filter both sides. Collapsible bottles can be screwed on both sides of the filter. Water can be squeezed through the water filter easily. Or hang bottles with filter on your backpack and use gravity to filter water while walking.