J.O.
We have the Potette and I like it just fine.
http://www.amazon.com/Kalencom-2-in-1-Potette-Plus-Blue/d...
It folds up nicely, has a travel bag, and I throw it in the the diaper bag (backpack) when I know we'll be out for awhile. I've even made an "emergency" stop in parking lot and my son was able to use it easily in the backseat of the car with no mess.