Water filter straw.
The Emergency Water Filter System is great for, travel, and emergency. It will filter up to 30 gallons (110L) of water.
This water purification Filter is tested and certified to remove l99.9% of Cryptosporidium and Giardia.It easy to operate, submerge the filter end into the water and drink through the straw. Very light weight and can be kept in backpack or surival kit.