The Petzl Bug is a very comfortable climbing pack that is at (or just below) average in most other respects. It's easy to pack for its volume and does the best job carrying the rope of any pack in the review. However, some other features are missing or incomplete. It's relatively substantial in weight, but not made of particularly durable materials.
You can read on to learn the finer points of our analysis or check out the Editors' Choice award-winning Patagonia Linked Pack 16L or Top Pick For Durability Black Diamond Creek 20.