Aquamira Emergency Water Filter
Made in USA. Emergency water filter system for hiking, camping, and emergency situations. Effective on protozoan cysts. Economical - 1 System filters up to 20 gal. (75L) of water. Lightweight and compact emergency water filter system; fits into a pocket. Removes greater than 99.999% of Cryptosporidium and Giardia providing you with safe drinking water. Easy to use so you can drink directly from any water source. Activated coconut shell carbon filter with Miraguard Technology suppresses bacteria, algae, fungus, mold and mildew within the filter.
Tested it. It all depends on what you are looking for. If you're looking for long term "survive the zombie apocolypse" type solution go to Life Straw and get their product for twice the amount. (yes I have one and the gallon bag). But I got this one to carry in my vehicle in the event of something happening like last winter when cars got stranded on the interstate, snowed in and couldn't move for hours. I've tested this one and it works fine for that.