HydroBlu Versa Flow Light-Weight Camping and Outdoor Water Filter System - Hollow Fiber Inline or Straw Filter with Clear Window That Filters 100,000 gallons for Survivor and Emergency Filtration MULTI-USE - Filter can be used on a water bottle, gravity system, bucket filter, inline water filter, or as a straw. Ideal for outdoor recreation, hiking, camping, scouting, domestic and international travel, as a filter for survivor use and emergency preparedness. DISEASE PROTECTION - The 0.1 micron hollow fiber membrane will protect you against 99.9999% of harmful bacteria such as Giardia, E. coli, protozoan cysts, Cryptosporidium and more. ENDLESS LIFE - Never buy another filter! Rated to filter 100,000 gallons of water you can have endless camping or place it in your bug out bag. The clear cleaning window allows you to back-flush or clean the water filter whenever it is dirty. LIGHT-WEIGHT - The Versa Flow Water Filter only weights 2 ounces and the (2) collapsible canteens weigh 1 ounce each. This is the ultimate ultralight filter that will last you a lifetime. LIFETIME WARRANTY - All HydroBlu Water Filter products are backed by a Limited Lifetime Warranty against manufacturer defects. Designed in Salt Lake City, Utah they are a family business that gives excellent customer service.