Track Daypack w/ Waterproof bottom?

Does the Track Day Pack laptop bag have a waterproof rubber bottom? I know it says so on the site, but when I was looking at a Track Day Pack in a local store, it had a normal bottom. Also, in some of the pictures of the Track Day Pack, it's hard to tell whether it has a waterproof rubber bottom.

I was also wondering how resistant to rain the Track is. I currently have a messenger bag and I love the rubber waterproof flap but my next bag will be a backpack that has to be able to resist rain for at most 15 minutes (my morning walk commute) with a laptop in it. Any other recommendations if the Track isn't best suited for rain?

Thanks!