I use a 2 L gray collapsible bag I fill from the water source, usually a stream. I attach to that a sawyer lifestraw, and aim the stream into a collapsible 3 L bag that U use only for filtered water. The only water I carry while backpacking is in a 1 L Platypus bladder. I can always use the life straw to filter more water. The only time I carry more than a bladder of water is when I KNOW I will be passing through a dry stretch with no stream or springs. Most of my backpacking is solo so I am filtering water only for myself.

aka "Boonerelli"

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