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The smallest. That's the whole point of having a small laptop in the first place. Avoid bulk.
+1, get the one that's fittest for your laptop.

Now if STM would only make their logo less blaring, or just less red...
 
+1, get the one that's fittest for your laptop.

Now if STM would only make their logo less blaring, or just less red...

I agree with that but the height of the bag is very close to the height of the laptop without sleeve.
 
I just received the STM Small Alley Bag yesterday. It is perfect for my 13-inch MBP. The padded section for the laptop itself is actually very big. I am still going to put my laptop in the Incase sleeve and then drop it in the STM bag. This will keep the Macbook from moving around.

It seems like a well built bag and has plenty of room for documents, cables etc. I would definitely recommend the small bag if you will be using it for the 13-inch.

Good luck!
 
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