i own the boblbee Megalopolis Executive and its a great pack for lugging my laptop around. but as a backpack to store car gear i would discourage that. it will barely hold my climbing harness and shoes. i have the side bags that attach to it as well, while those increase the storage its impossible to keep anything organized. as for the comfort and weight issue, it is one of the best fitting bags i own but it weighs ALOT empty. it is pretty water resistant though (kept my laptop dry when i sunk my jeep in a small "pond". <img src="/images/graemlins/tongue.gif" alt="" /> hope this helps out