1. Multi-purpose: easy to carry and use, water filter straws lifesaving equipment can be used for travel, sports, hiking filters, camping filters, outdoor work, during natural disasters, emergencies and much more. 2. Filter purifier: each type of water purifier survival filter adopts hollow-out fiber membrane design, 0.01 micron filter can effectively remove 99.99% harmful bacteria. 3. Compact design: portable filter straws are 21.5 x 3.3 cm in size and come with a portable clasp that can be snapped into a convenient place for you to take off and use at any time, so you can enjoy fresh emergency drinking water anytime and anywhere. 4. Fresh water: this filter reduces the risk of infection by removing E. coli, Legionella and Salmonella and is designed to provide fresh, drinking water; it also aims to improve the taste of drinking water by reducing chlorine, harmful particles and unpleasant odors. 5. Long life: although the filter is small, it has a filtration capacity of 1500 litres and is equipped with a compass and an emergency whistle to help you on your outdoor trips.