Water skin is a container made of animal skin, usually used for carrying water. There are several synonyms for water skin. One synonym is water flask, which is a similar container, but made of different materials such as metal or plastic. Another synonym is canteen, which is a container with a strap for carrying on one's person. Skin bottle is also a synonym, which refers to a bottle made of animal skin or leather such as a wineskin. Other synonyms for water skin include bladder, pouch, and sac. These synonyms are often used interchangeably, depending on the context and region.