I would think one of the Pentax or Mamiya 645's with a pistol grip would be about right, if the negative size is OK. I use my M645 when I know I'll need to change rolls quickly and find the inserts to be simple. When I'm out walking I usually carry 2 extras plus one in the camera for a total of 45 exposures (or 90 w/ 220 inserts).

JeffW.