I just got back from a day trip out to my favorite light station, Pigeon Point. I hiked a total of about 1.5 miles round trip in the sand up and down rocks, hills, etc. carrying my RB in my hand with a 90mm lens, and one 120 back. in my backpack I had three more lenses and extra filters, film. Spot meter around my neck, tripod hanging through one of the straps on my backpack and two more backs in my cargo short pockrts. I am guessing I was loaded down with about 30lbs of gear. So, yes, it can be done. Was it as fun as if I had been carying one lens? who knows. The bottom line is you need to bring everything with you, or else you are going to be weishing you had it. I only used two lenses today, and brought two more just in case.. oh well.