This is a mid-sized combination system, capable of holding 70 oz (2 l) of water and 988 cu in (16.20 l) of supplies. It's a generous day pack. This pack was requested as a representative urban or camping pack, an alternative to the hip-hugging packs which I both love and hate. Even better, I hoped it would fulfill the needs of our female testers, who are sometimes overlooked in the forest of uber-macho rucksacks.