So last summer I took my nephew backpacking for the first time and he liked it, wants to trying doing it more. I want to give him a backpack for his high school graduation present, but I'm unsure on how big of a pack to give him. (I'm also limited by the desire not to spend much, so I'm looking at REI Outlet or Sierra Trading Post). I'm looking at a North Face Terra 50 3100 cu in model. I don't want to get him a monster hauler, but I don't want to pinch his capacity too much. Because he's inexperienced, I expect he'll want to bring a lot of stuff with him, which is ok when your 18 and have healthy knees, I guess.