A friend of mine (American) will be backpacking across Europe from the U.K. over the summer for at least a month and it's her first backpacking experience so she has no idea how to begin (neither do I, obviously). She first wants to know, from those who are experienced backpackers/vagabonds, what pack is a good one for beginners? Not crazy expensive, either, but a good, solid pack that she can carry her essentials and more in (sleeping bags, pillows, toiletries, clothing, memorabilia, etc.) for about $200 USD or less. Any thoughts?