Belt Bag Base Size for Laptop?

Hi all. I saw these sizes but I'm not sure what the actual width of the base is. Would it fit a 13" MacBook Pro?

Does the small and mini come with a strap? Then medium doesn't? Hope someone can clarify. :smile:

Celine Mini Belt Bag: 11′ x 9′ x 6′ inches
Celine Small Belt Bag: 12′ x 9′ x 9′ inches
Celine Medium Belt Bag: 12.2′ x 9.44′ x 7.9′ inches
 
Celine discontinued the small and medium I believe. They are now only selling mini, but I think some boutique prob still have the small size. I'd suggest if you want the small, you have to be hurry :smile: