Loved these. It is so easy to determine which bag is going to hold what, the dual zippers make it easier to close if you have a tendency to overstuff, and it made unpacking and replacing a breeze.  We simply threw them into the hotel room's dresser drawers and knew what was in each. This coupled with the slim cubes set is more than enough for a typical roll aboard style bag. Took a tip from other reviewers here and got different colored cubes for each family member, which proved invaluable. The material seems sturdy, and I even washed them in the washing machine with zero issues.