If you travel often - even just for a night or two here and there - and you don't own one of these, do yourself a favour and get one.
Basically everything that you use in the bathroom can be popped into one of these.
When you arrive where you're staying you just open it up, hang it on the shower sreen or towel rail and everything you need is right at your fingertips. When you're leaving just fold it up again and your bathroom packing is done!
There's also a Beauty Case and a Cosmetic Bag in the range to carry anything else you need.