Hi folks, I'm looking for a cute, lightweight, durable wheelie bag (that's also ideally a backpack) that meets Ryanair and EasyJet carry-on requirements.

I have a backpack with wheels that's black with hot pink accents that is perfect - but it doesn't fit on Ryanair, etc's carry on requirements (it's too thick).

My budget is under $100 for this elusive piece of luggage - suggestions?