I have a Maxpedition Kodiak gearslinger. Mostly I use it as a laptop bag. It works very well as a bookbag, not so well as a pack. The single strap is fine for short periods but over time it puts a lot of pressure on that one spot. I've found it gets to be too much if you load it down, but it's fine for computer.
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“I'd rather have questions that cannot be answered than answers that can't be questioned.” —Richard Feynman