Lowepro's DSLR Video Fastpack AW bags are like having A/V closets on your back. Each stylishly spartan pack can hold your camera, multiple lenses, lights, audio gear, a tripod, and your laptop without breaking a sweat. It'll make your next shoot much much easier. Starts at $120. [Lowepro]
I have the Burton Zoom pack. Prices on Google are showing up far higher than the $80 or so I think I paid for it about 3 years ago. I appreciate that it doesn't look like a camera bag - more like a snowboarding backpack - and that the camera block inside is fully-configurable with velcro walls. If you take all the walls out, the bag is cavernous. I've been known to go away for 5 days fitting everything I need in here: clothes, camera, lenses, laptop, toiletries, and extra shoes.