Features: 1. Special Features: Four-stage filtration system! Water Filter contains no chemicals, no batteries and no moving parts to wear out. 2. Rapidly Quench Your Thirst: It features a high flow rate 3. Convenient in Use: Insert it into water and drink directly! 4. Safest: thoughly remove bacteria and virus, can eniminate 99.99% In nature, you do not want to chance drinking polluted water. Depend on SDS’s Personal Water Filter Survival Straw to purify water from lakes, rivers, or streams. straw water filtration system is a portable and reusable filter that doubles as an emergency water purifier during natural disasters when you cannot access clean water. Hiking water filter system keeps you hydrated and can be used instead of a water bottle. Avoid boiling water and instead, use the outdoor water purifier straw for fresh-tasting clear water. Whether you are packing for the outdoors or collecting doomsday prepper supplies, the emergency water filtration system is necessary. Material: ABS Color：blue size： Lanyard: 46cm Straw: 20.2*0.9cm Filter: 22cm*3cm