Pannier is a type of BASKET or container that is typically used for carrying items on the back of a bicycle or horse. It is also known as a dosser, which is a term derived from the French word 'DOSSIER' meaning 'BASKET'. Panniers are usually made of woven materials such as wicker or canvas and are designed to be easily attached to the back of a bike or horse. They are often used for carrying groceries, camping gear, and other items.