I have a Mountainsmith Office laptop bag which I use as my personal item. On an upcoming trip, I am going to have to check my bag, and will be doing an awful lot of walking and don't want to be lugging this around on my shoulder the whole time. Anyone have a good reccomendation for a nice small luggage cart which I can put the laptop bag on to give it wheels? I want something that I can also leave on the bag, but still carry it over the handle of my hardside case when I leave the airport.

Thanks!