I use a North Face Galileo (sp?) backpack with a detachable daypack. I am fully satisfied with the bag.

I've backpacked around Europe with other bags and this bag is like 5 times better.

I've used the bag in Central America/Mexico, Australia, Southeast Asia, and Africa (I move around a LOT when I travel, usually by ground transportation like crowded buses, etc).

The compression straps are a HUGE plus that every wilderness pack has but aren't always available in travel bags. It allows you to adjust the distribution of weight so that the core of the weight is closer to your back making it easy to shove in corners and comfortable to walk in.

The backpack also has built in zipper locks and a wire that goes through the frame for security when locking up your bag at the local hostel.

It comes in three sizes, but I have the medium one and I am satisfied. I ordered mine from moosejaw.com

Matt