BrightPath Personal Water Filter Straw - 4-Stage Carbon Filtration System, 0.01 Micron Survival Gear For Hiking & Emergency - Connects To Bottles, 1500L Capacity, Style/Vibe: Outdoor, Sporty, Tactical, Minimalist. Function: Water Purifier, Survival Gear, Camping Accessories, Hiking Equipment. Feature: , Portable, Reusable.