The 10 x Contigo Clybourn FreeFlow Carbon Fiber Replacement Filter in Blue/Gray is a high-quality water bottle filter designed for outdoor activities such as camping and hiking. Made of durable plastic and featuring carbon filtration technology, this filter provides clean and safe drinking water on-the-go. With a filter life of 300 liters, this bottle also includes convenient features like a flip-top and screw cap for easy access. Whether you're a man or woman, this unisex water bottle from Contigo is a reliable and practical choice for staying hydrated in the great outdoors. Plus, with free shipping included, it's a great deal for anyone looking to stay hydrated and healthy while enjoying the outdoors.