I'm interested in a bag that is inconspicuous and I've heard good things about the Retrospective 30. When looking at the design, I noticed the 20 is a taller bag & can hold a body attached to a 70-200 vertically. I use that lens quite a bit when traveling or photographing around town so I like the fact that the 20 is a taller bag.
Can anyone give me their 2 cents about the 30 vs 20 with the above consideration of the 70-200 lens?
Thanks.

