Several people at Per's Owens Valley workshop asked how much my camera and tripod weighted. So here is the info:
Tripod with Majestic head: 10lbs.
Film holders: 3lbs.
So, I have four holders and even with the three lenses, extension rail, darkcloth and other misc. items I think the system will come in at under 40 lbs. When I find the time and $$$ for a backpack you can bet I'll get one.