BTW don't confuse the webtex filter with the drink-safe one as they are actually totally different. Drink-safe does filter out virus' and has been tested by EPA and MOD to this effect. Webtex one is about the same price but does not take out virus' but does look very similar. IIRC there has been a bit of conflict between the two companies. I am about to buy the drink-safe aquaguard eliminator inline filter ion the recommendation of quite a few on another forum. I liked its flexibility, gravity filter or inline filter methods of use. Since I will be using a bladder it fits in well with my use requirements. At camp I can gravity filter it into a flexi bottle. It can be back-flushed too. It comes with various attachements to make it rather flexible. IMHO better than the lifesaver bottle and only 75g for the filter part is rather light!