I got the small carry-on size. The suitcase was smaller than I expected but it is quite deep, so it's able to accommodate quite a bit of clothes, toiletries, etc. assuming all you need to pack is a day or so worth of clothing. Note to purchasers: The plastic case is very thin... so far I've never had to check-in the carry-on, but if I ever did, I wouldn't be surprised if the casing gets damaged/punctured. Also, the wheels don't swivel, I suppose a spinner suitcase is not absolutely necessary for such a small suitcase but had I known that up front, I may not have purchased the suitcase.