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When I was looking through the options myself, Grayl was the clear winner.
>filters viruses, 9/10 of the others dont so you're still risking disease which makes them pointless on their own
>takes only a few seconds to fill
>no convoluted pumps and hoses to fuck around with
Its a bit expensive, heavier and doesnt last as long but I just dont see the point of compromising on virus protection.