When I went to Colorado last year, my Tamrac expedition 7 weighed 29 lbs (according to the airport scale - I didn't check it but was curious). When the time came to hike Longs Peak, it all stayed back in the hotel and all that came along was a Canon S2 (d*****l 10x zoom P&S). And even that felt like too much at times.

My opinion, take just the A-1 and 35-105 and leave the rest behind. If your A-1 has a motor drive on it (as mine does) take it off and leave that behind too. If you get the strong urge to shoot B&W, unwind the color roll carefully, being sure to leave the tab out, shoot your B&W and reload the color, sacrificing a frame or two to prevent overlap. Repeat as necessary.