If you buy a "big roomy backpack" you won't be able to take it as carry-on luggage on the plane! Wasn't that the whole idea?

We will be there July-ish. And I guess I was feeling greedy again (I'm used to at the very least living out of a duffel bag). Small backpack it is.

Why not use a duffle bag if that's what you like and what you are used to using? Nothing sacred about a backpack. Whatever you choose just make sure it fits the size and weight limits for your specific airlines, if you want to keep it with you.

If your bag is small enough, you can skip the cable lock deal.

Take a look:
www.onebag.com/home.html
Gaspard