A STEIN is a type of mug or tankard typically made of stoneware and used for drinking beer, and is a 5-letter solution to the term 'cologne container'. A VIAL is a small container, usually made of glass, and is 4 letters long. EAU is a French word meaning 'WATER', and is 3 letters long. Rhine is a river in Europe, and is also 5 letters long. TABU is a type of cologne, and is 4 letters long. Ach is a German word meaning 'river', and is 3 letters long. All of these words are related to cologne containers, and can be used as solutions to the crossword.