I know this is an old topic but it may help someone else. I bought an Osprey Aether 60L based off of recommendations from this site. It is the perfect size pack to fit everything you need including a bear canister (I use a bearikade weekender for reference). I thought about going with the next size bigger but I am glad I didn't as it would just be wasted space or cause me to carry something extra I don't need to take. I love it although my nephew bought one also and he complained the hip belt dug into his hips and was uncomfortable. I have had no such issues.