A pannier is a type of container or bag that is typically used for carrying goods, especially on bicycles or animals. Panniers are often attached to the sides of a bicycle's rear rack, providing a convenient way to transport items like groceries, camping gear, or personal belongings. They come in various sizes and materials, including waterproof options for outdoor activities. In addition to bicycles, panniers can also be used on animals, such as donkeys or horses, for carrying supplies during travel or work. This design allows for balanced weight distribution, making it easier to transport heavier loads without straining the carrier.