Hi folks

Thinking about replacing my school backpack from undergrad (back in the dark ages). I'm thinking a sling bag might be a bit more professional looking, and saw this from CTD:
http://www.cheaperthandirt.com/MOLLE401-65365-1964.html

Anyone had experience with this bag in particular, or this style in general? Wondering how tired my shoulder will be from weight on 1 side, if I can throw it over the other shoulder, if its balance is good, how much can be carried, etc.

I also like the MOLLE straps. If need be, I can attatch my car kit bags to it, and hike out of trouble (though I realize this would radically alter the ergonomics of the bag)

Thanks!