This is the modern equivalent of my old Tamrac bag. Two F3HPs with md4s. Two F4Ss and five or six additional lenses/adapters. I used to carry my F4S along with an Vivitar 283, film, batteries, 3 lenses and an FM2 with three lenses. Never have had a problem with that bag. Rain, snow, sleet, etc.

http://www.tamrac.com/products/pro12/