I'm a little late to the game here. I just added a Canon EOS Rebel T3i to my kit. I packed the body and two lenses (in my camera bag) inside my Badlands 2200 along with my hunting gear then used the outside straps to secure my lone wolf arm and climbing sticks. Worked like a charm, but my point is that my 2200 was full! I wouldn't recommend going any smaller.
Hope this helps!