The Lot of 4 Contigo Wells Water Bottle Replacement Filter Cartridge 2-Pack 1217724 is a set of water filter cartridges specifically designed for Contigo water bottles. Made by the manufacturer Contigo, these cartridges are essential for keeping your water clean and safe while on-the-go. Perfect for camping, hiking, or any outdoor activity, these cartridges provide a convenient and reliable way to filter water in a portable bottle. Stay hydrated and protected with this high-quality replacement filter cartridge set.