Lane Lewiswrote a review of Gravis Battery Backpack - 28L on March 27, 2011
This backpack is extremely well made and has a killer ride on your back. The material it's made from is durable and the stitching is top notch. There are plenty of options in the pocket department, it could have used a few more pouches in the pockets though. The laptop pocket is right in the back, so if you don't like your laptop on your back, you might not like this backpack. Also, the pocket is a little smaller than advertised. I have about a 17 inch laptop and it just barely fits; I have to fiddle it in and flip out a few edges.
Overall this is a solid pack. I'm really impressed with Gravis as I have never owned a product from them before. If you see this thing on Whiskey, grab it, it's well worth the money.