I also got the 10 version.
LOVE the outside materials, very stealth, and the size is just perfect.
It doesn't have the thermal lining like the 15 does, but I think that's overrated. also, it's a BLACK bag, you may want to keep it out of the sun anyways.
My only knock is that the zippers are subpar. they tend to get caught halfway on the inside lining.
Other than that, it's an awesome bag. Roomy without being absurdly oversized.