A better bag

I like my Timbuk2 Detour 2 -- mostly. The main flap doesn't fully cover the opening at the top; rain gets into the main compartment. Also, the side pockets are too shallow; my 2-liter Nalgene bottle and travel coffee cup fall out from time to time.

So, I decided to modify it. I'm handing it off to a local shoe repair guy who has an industrial sewing machine and strong kung fu to make the changes shown in the mock up.