A water bag is a container specifically designed to hold water. There are various synonyms for water bag, including a canteen, flask, hydration pack, water bottle, and reservoir. Each of these synonyms offers unique features that make them ideal for different situations. For example, a canteen is a small water container designed for outdoor use, while a water bottle is a more versatile option that you can take to work. A hydration pack is perfect for active individuals, whereas a reservoir is meant for use in backpacking or camping activities. Regardless of your need for a water container, knowing the various synonyms allows you to choose the right one for your specific situation.