The ThinkTank Airport SecurityTM V2.0 or the slightly smaller Airport InternationalTM V2.0 rolling bags both make fabulous roll-aboard carry-ons.  If your preference is for a large backpack that can serve as your carry-on, they offer several great models.  To check out or purchase ThinkTank products, click here:  When you order merchandise totaling $50 or more you will receive a free Think Tank bag.  You can check out the choices here: