The Survival Straw offers the same trusted Aquamira filtration performance, now with a dramatically increased filtration capacity - up to 300 gallons (compared to 30 gallons for the Frontier Straw).Features :Parasite FilterLightweight, Compact, and Portable ProtectionAntimicrobial Treatment Reduces the Growth of Bacteria, Algae, Fungus, Mold, and MildewBPA-Free, Chemical-Free, and Iodine-Free