Platypus Water Tank

This bladder is amazing. I love the seal style opening. We had a gravity system for the camp water so it was easy to fill one bag a dump into the big opening. That being said make sure it’s sealed before you put it in your pack..........Had to hang dry some gear.

Will not stay zipped. I filled it to every mark on the bag and it won't stay sealed.

I bought 2 of the 6L tanks last fall and used 1 of them in CO backcountry muzzleloader hunt. It was great for hauling filtered water into our spike camp from a nearby stream but the Big Zip was problematic. I don't think you can actually fill these all the way and still have the Big Zip stay zipped, at least that was my experience. As soon as you pick it up by the handles when full the Big Zip unzips which sorta sucks. Mine might just be a dud and maybe I need to experiment more with it. If it had zipped it would have been fantastic, but even with a partial load and it partly unzipped it still served a crucial role during the hunt.