http://www.backcountry.com/store/JAN0079/c3/s8/Jan sport-Optimizer-Backpack-1850-cu-in.html
1. $99.90 is a bit pricey, but it is the best damn backpack I have ever baught.
2. On off days I can carry stuff for a long weekend with no problem. The gel straps are comfy and the "mesh back" makes it easy to carry for hours and not have that "sweaty back" syndrome I had with other backpacks.
3. I used to be a systems engineer deploying SAN's all over the US, so that bag has been through quite a few airports and still looks pretty new even after 1.5 years of constant beating.
4. Besides having a dedicated notebook "pocket" which has a spring type cushion on the bottom in case the bag is dropped (also great of stuffing folders as well), it has 2 large compartments to hold chargers, dongles, fiber cables, xover, clothes and etc, 1 smaller compartment to hold pens, floppies, and PCMCIA cards, 1 front pocket great for keys, gum and USB keys. Two small side pockets great for loose change and/or hankerchiefs. Top pocket which can hold CD player, MP3 player and wire the headphone cables through a dedicated "headphone port". (Holds the Bose noise canceling headphones and a gameboy SP with no problem). Having a cell pocket on the left shoulder strap that holds Nokia 8250 is great/horrible because you can never claim your cell phone was out of reach or you didn't hear it.