I have the booq Boa XL. I tried a couple of other $100.00 backpacks and roller bags and none are as comfortable and easy to use as this booq Boa. It's like $50 to $60 more then the usual bags you find in Circuit City and the likes but boy is that bag worth it.
I fly between Boston and Detroit every week with a 9860 and all of my other stuff, Power Brick, PSP, a bunch of paperwork, cables, batteries, CD book, iPod, external Drives, etc. It all fits in there just fine and is comfortable on my back.
One more thing, the other day I inadvertantly knocked my bag down from the kitchen table with my 9860 inside it. Nothing happened to my laptop. The padding saved it.
So there you have it. Buy a booq Boa if you don't have massive amount of stuff to carry and don't want to spend $200.00 for a bag. Otherwise get the bigger one. Alienware seems to have an interesting looking bag for around $139 as well. I don't know how that one is though.