I'm a fan of Axiom Journeys, especially the non adjustable one. Generally can find them around $35 shipped online, as far as I can tell they are sturdy enough. As others have mentioned, though, 60# on the back is a LOT. I overpack, and generally don't have more than 30-35# back there, and that is noticeable. Unless you were heading for an expedition on a scale where cost should not be a concern of yours I can't see a great reason to need that much weight.