[Noisebridge-discuss] how to evaluate a shipping bag that claims to be a water filter?

[jim]

    can anyone provide pointers for evaluating the 
life-sack, advertised to be used as a bag for 
shipping grains and after receiving the grains the 
recipients can use the bag as a 15nmeter filter, 
which purportedly passes only water. 

http://inhabitat.com/life-sack-solves-drinking-water-issues-for-the-third-world/