Looking at these two bags, and undecided which one to go with. It will be used as an all purpose bag, from day hunts up to week long hunts (maybe longer eventually but not for the foreseeable future). The Metcalf is advertised as the all purpose bag, but I just wonder if I could get away with using the Marshall as a day pack and have the extra storage room for the longer hikes. I really like the extra external pockets on the Marshall. Anyone out there have any input? Thanks a lot in advance!