I've used a timbuk2 backpack that has 2500 cubic inches of space. Volume will be his problem rather than weight. My backpack weight was about 15 pounds and I could barely close the thing because the sleeping bag and sleeping pad took up a lot of room, didn't carry a tent or cooking stuff. See if you can wrangle up a large saddle bag for him. I had this saddlebag for items I wanted easy access to http://www.bikebagshop.com/minnehaha-bags-c-781.html. No problems with handling. But at the end of the day my shoulders and back were a tiny bit sore. nothing too bad.
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