The Contigo Filtration Replacement Cartridges Gourde is a 2-pack of filters designed for the Wells Water Bottle. With a filtration technology of Carbon/Charcoal and a filter life of 60 gallons or 3-5 months, these cartridges provide clean and safe drinking water on-the-go. Made in China by the reputable brand Contigo, these gray cartridges are a convenient and effective solution for those who prioritize clean hydration while camping, hiking, or engaging in sporting activities.