A water bottle is a container designed to hold liquids, primarily water. It is commonly made from materials such as plastic, stainless steel, or glass. Water bottles come in various sizes and shapes, making them convenient for different activities like hiking, sports, or daily hydration. Many are designed to be reusable, promoting environmental sustainability by reducing single-use plastic waste. Most water bottles feature a cap or lid to prevent spills and keep the contents clean. Some models include additional features like built-in straws, filters, or insulation to maintain the temperature of the liquid. Popular brands include Nalgene, Hydro Flask, and CamelBak.