Poser
WKR
I carry a Platypus 3L which I filter water into and then fill my drinking bottles or cook pot with. I often carry it when bike touring as well since it’s nice to be able to filter a lot of water at once (enough for dinner, breakfast + refilling bottles in the morning) when sitting around camp vs. having to fill individual implements. Also use them backcountry skiing since, with an air bag pack, layers, tools etc, space is usually at a premium.