Laptop Backpacks

MEC Deluxe Bookbag Daypack - Mountain Equipment Co-op
has a suspended padded laptop compartment and doesn't look like a computer bag

I highly vouch for the MEC Daybag, it's a steal for $39 (must have a $10 MEC co-op membership) although the protection is just barely adequate and would combine a sleeve if you think you may be throwing the bag around. I bought mine back in 2004 and used it to pack in books through school, it's not very large inside and probably the 13" MB is the biggest thing anyone would want to try to fit in there but unlike any other backpacks I've ever owned... I still have mine to this very day. It's been crazy durable with just minor cosmetic issues. I mean ferry two binders four textbooks and whatever gear you can fit into there 200 school days a year durable.

The bag I have right now is a BBP, a really nice messenger/backpack hybrid that you can get at Carbon Computing. BBP Bags are super ergonomic hybrid messenger/backpack laptop bags It's a great versatile bag with plenty of storage including two cup holders, water resistant, and super comfortable however you wear it -- backpack style, messenger bag style, shoulder bag style, backpack on one shoulder style, or like a briefcase. The luggage pass-thru port was very handy during my last trip, and I use that compartment to store newspapers and magazines when commuting. And props to Carbon for helping me get my BBP despite the circumstances.