Messenger bags for 13.3" laptop

I am looking for a messenger bag to hold my new 13.3" inch laptop. Exact dimensions of the laptop are: 12.7" x 9.2" x 1.0"

Since this is a smaller laptop, I do not want a huge oversized bag. I have been looking at ebags.com, and Crumpler bags look very promising, but I am a little confused by the following:

The Moderate Embarrassment is advertised as a 13-inch laptop bag on the Crumpler site. But ebags says that my laptop will not fit.

It looks like The Considerable Embarrassment would be a better fit, given the specified dimensions. However I am concerned that a so-called "15-inch laptop bag" would be too big.

Does anyone have any experience with these particular bags, or any messenger bags that work well with 13.3" laptops? I would appreciate any advice, as I hate to buy site unseen..

Thanks!

 

Now I have found two more possibilities from STM bags:

scout small
cargo small

Does anyone have experience with Crumpler or STM bags?

 

Can't be bothered to convert the measurements into SI, but this bag looks pretty hot imo:

be.ez | products

so might wanna check it out.