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It lasted on two hikes for 1 person, on third hike the water would stop flowing through. No particularly dirty water, I drunk from mountain streams, didn't stick it in mud. It gave me approx 3-5l of water in total. Rubbish
Man sollte sich auf der zunge Zergehen lassen 5000l Liter. Pro Tag 2L = 60 Liter im Monat (30T) und 720 Liter im Jahr. Sprich reicht für 5 Jahre wenn das Wasser nicht stark kontaminiert ist sonst reichts für 13 Monate
As a survivor of the apocalypse, I can testify that these straws are great in a pinch. After the event, fresh water was becoming harder and harder to find. As I am in the Midwest, I had the opportunity to use this at an old, stagnant, cattle watering hole. Despite the water condition, I was able to keep myself hydrated until I could create a more sustainable method. Works as described. Also, if anybody is out there, I have food, shelter, and protection. At noon every day, I'll be at the...