These seem pretty handy. Purifies 500 litres from 99.9999% of waterborne nasties... a new addition to the kit bag or a gimmick? What do you think...?
http://istraw.co.uk/
http://istraw.co.uk/
I like the look of that system and it sounds pretty comprehensive so far as the purification goes. I like ythe idea of the impregnated bottle as well.