I bought this based on the reviews. I didn't want anything as big as a 30", so I went with the 26"  I was a little worried when I received it, because it was for a ski trip and I wasn't sure if it would hold everything I needed it to.

I was able to put my ski boots, a pair of Uggs and all my ski gear (bulky jacket and pants) in the drop bottom and my regular clothes (sweaters, jeans), big toiletry bag and hair dryer in the top. It was stuffed to the gills, but it held it all for a 4 day trip.
It came through baggage just fine.  Highly recommend.