Shower bags are portable containers designed to hold water for outdoor showers. They are typically made from durable, waterproof materials and can be filled with water before being hung from a tree or other structure. Many shower bags come with a nozzle for easy water flow control, making them convenient for camping, hiking, or beach trips. These bags often feature a black exterior to absorb sunlight, warming the water inside for a more comfortable shower experience. Some models include additional features like a built-in mirror or storage pockets for toiletries, enhancing their usability in outdoor settings.