I, too, used to use the Tom Bihn 3-D Clear Organizer Cube (
http://www.tombihn.com/accessories/TB0917.html)
But then I was stopped at London Heathrow and forced to empty all the contents into one of their generic plastic bags to prove my liquids complied with regulations.
Since then I have been using the Hefty Freezer bags. I like them better than Ziplock due to the better sliding lock system.