I travel constantly and have been able to have only one bag with this one. If you get a Kata inseratrolley, and put the shoulder strap on the BACK of the Transorter bag, the shoulder strap fits on the trolley, so you can instantly add wheels! The shoulder strap quickly slips off and on the trolley. I assume it would do the same with almost any trolley. The reason the shoulder strap can work this way, whereas most cannot, is that it's attached to the bag diagonally. It's easy for me (a small woman) to carry the bag fully loaded by using the two handles on each end when I need to get in or out of a plane where we go on stairs instead of a "bridge."

I got a Samsonite Outlab laptop backpack that I put INSIDE of the Transporter. By doing this, I have only one carry-on in places where only one bag is allowed. Where two are allowed and they weigh the carry-on, I take out the Samsonite and have them weigh just the Transporter (without trolley). Easy! I am able to travel for up to 8 months from Moscow to Delhi to Brussels to Honolulu with enough clothes for all seasons and full electronic gear with this great bag.

After years of looking for the perfect one-bag carry-on solution, I found this bag (in an adventure store in Sydney, Australia) and immediately gave away a far more expensive bag I had been using. That one can find a bag of this quality, at this weight, is amazing.

Keep in mind that there are only two pockets--both external--one small and one larger. For inside organization, I have gotten the ultralight bags from Granitegear.

By the way, the whole bag fits into its larger external pocket for storage or if you want to bring along this as an extra just-in-case bag or to bring stuff you buy abroad.