This bag is the steeze beez kneez. Super Versatile. I'm outta my house for long periods of time and always have a bag. my ogio street just broke. This bag is equal if not better than that. room for all the things i have with me, including laptop, chords, a lunch, study material (so a few books about and inch each), zune, chords and headphones, stethoscope (I work first aid sometimes and use my own stethoscope), sunglasses/case, and still have room!! even with that much weight, its easy to haul around such a load. Contrary to the tech specs, there is a waistbelt that helps keep the pack close and secure.
I've taken this hiking, to work, used it as an overnight, and just as a day to day pack. After some staring at it, and my EMT senses tingled: i found i could even use this as a pretty effective trauma pack. It'd have room for a 150 piece kit at least (splints, gauze, curlex, scope, cuff, etc.). If you need a day to day pack that you use for all purposes, THIS IS YOUR BAG! No regrets. versatile