We have fat suitcases. They're not huge, but they are fat, and because of the style, when opened they are only a little bit thinner. They would not fit under the bed, opened or closed. The only luggage we could fit under the bed was a big hard-sided suitcase (opened) and our garment bag. We put duffel bags inside the open suitcase. The other suitcases had to be stowed in our closet and under the desk. They were in the way the whole week. Grrrr...
The problem is that the beds are not that far off the floor. Sure, we could lift the frame and slide our suitcases underneath, but then the weight of the bed was supported by the suitcases! Not a good idea.
Just thought I'd put out a warning that you might run into this problem too. If anyone has a good guess as to the number of inches between the floor and bed frame, that would be helpful!