Reposted from another thread
I've been a big fan of SpireUSA.
I purchased a vertical bag back in 1999(?) for my then new PowerBook G3 Pismo. I've been using the same bag with different Macs (currently a MB Pro 15") for the past seven or so years and it's still in great shape.
But I realized the MBA (for me) is all about weight and my bag probably weighs more than the MBA, so I decided it is time for a new bag. But I wanted one that is small, light and easy to lug around.
I looked at many manufactures, but decided to stick with Spire. I purchased the Spire 13" Dart. It weighs about a pound and looks like it'll fit the bill. It should be here on the same day as my MBA. I couldn't have planned it any better.
They have a cool 360 view that really shows how thin this bag is and also has compartments for some docs, adapters, etc. Check it out.
https://www.spireusa.com/products/DV8.htm
PS, no I don't work for them. I'm just pretty jazzed about not having to lug 10lbs worth of stuff everyday.