What is "bota bag"

n. A traditional Greek or Spanish wineskin bag. Typically it is made of leather, and is used to carry wine, although any liquid can be carried.

A bota bag or wineskin is a traditional Spanish liquid receptacle. Typically, it is made of leather (when made of goatskin it is known as a goatskin itself), and is typically used to carry wine, although any liquid can be filled into it. Often referred to as a canteen.