I just picked up the eagle creek one mentioned by a couple people here, its currently on sale at a chain called "the container store" for 27.99 instead of the $35 everyone else has it for. The right most picture at the rei link shows a toothbrush sticking up and if you try that it doesn't fold up very well.
The three sections work well, I put my daily stuff in the center, deodorant, electric razor, toothbrush, comb, etc, then shower stuff in the bottom removable flap so I can take it off and take in the shower and then the less used stuff in the top, nail clippers, headache pills, etc.
What I have done now is use this every day at home too. Our bathroom seems to be shrinking as the kids get older so I put all my stuff in here and hang it in my closet then take it in the bathroom in the morning to shower before I go to work so when we take a trip ZI don't have anything to pack, its already done.