The Lot of 4 Contigo Wells Water Bottle Replacement Filter Cartridge 2-Pack 1217724 is a set of water filter cartridges designed specifically for Contigo water bottles. Manufactured by Contigo, these cartridges are essential for maintaining clean and safe drinking water while on the go. Perfect for camping and hiking trips, these replacement cartridges ensure that you can stay hydrated and have access to fresh water wherever you are. With this pack of 4 cartridges, you can trust that you will have a steady supply of clean water for an extended period of time.