toilet bag 
noun British
A waterproof bag for holding toothpaste, soap, and other bathroom items when travelling.The mystery gent who arrived with a toilet bag three times the size of his girlfriend, full of potions and gels, also brought a supply of fine wine....
- Early this year he received a toilet bag with socks, underwear, hankies, vitamins and books.
- Police searched another room where he had been staying and found a quantity of cocaine in a toilet bag.