In many rural regions of Spain, wine is still served in leather bota bags (http://en.wikipedia.org/wiki/Bota_bag), which in the 15th century were called borrachas, in Catalan.

Borracha comes from botella (bottle) y morratxa (a type of laboratory bottle). Later, the word borracho was used to talk about a drunkard, someone who was lleno de vino (full of wine).