I have a Lowe Pro Photo Trekker ( I think that's the name). I bought a relatively big model to hold all of my RB equipment for storage, and travel. I easily holds the body, my 4 lenses, 2 film backs, the eye level finder, light meter, lots of film, and even a sandwich. I rarely take every thing, mainly becase fully loaded we're talking around 35 lbs. on my back. It's very well made, and offers great protection for the gear. Last year I was in a situation wear I had to slide it down some ice, and snow covered boulders(note to self, take rope next time) to get to where the shot was and it (and my gear) were unscathed. It's also a very comfortable carry.