I know they are expensive, but I just picked up a Jack Weatherproof bag from Jill E. It has tons of room for my Mamiya 645AF, plus I can either throw my trusty AE-1 35mm or almost all of my hand processing gear in it (except chemicals) if I am going to go use the lab at school instead of processing negatives at home. I got a deal from my local camera shop on it (219.00 +Tax) but Adorama sells it for 289.00. It is made of all leather and has a padded laptop pocket on the back for up to a 17", but mine is usually full of film. Just a suggestion.
I know you have purchased the Tenba bag, but thought I would throw this in just incase someone else came along looking for the same info.