ok
I bought also this nice bag from REI
It fits my lunch (not small) my dress pants, my shoes (size 13) my dress shirt, socks, etc ... and then its full
The thing i like is when i want to go fast on my bike it does not create that much aero drag.
Lightweight when empty too ...
my extra large classic timbuk2 bag has 4 times the capacity.
Both have their functions; but I wanted something smaller for going to work back and forth.