Rebe’s laptop sleeves are designed to fit into any tote or overnight sac for quick and safe access to your laptop. These days, I am yet to be impressed by all the laptop bags out there. I have seen some really great totes, and that is what I tend to use as a laptop case. Problem is they do lack padding, and my laptop is a bit bulky. I own a few laptop sleeves with padding and this is how I ease my mind. They are a great way to carry your laptop without screaming, "Rob Me" with those over expensive designer cases we all covet. Price: $78 at Rebe.com
Techie Diva's Guide to Gadgets 
These are cute. If you’re buying for function though, try thepouch.com for very well made neoprene laptop covers. They show The Laptop Pouch with a strap and a pocket, but will make it as just a cover – customized exactly to fit your model of laptop. I’ve been buying them for 5 or 6 years years now and wouldn’t own a laptop without one.