I am using an Arca Swiss F Compact, the one with the folding rail. 4x5. And I can't seem to figure out a great effective, efficient way to pack it so that it's quickly available for use. it is quite compact in the bag when I slide the rail out of the standards, but it is a time consuming hassle to slide the rail back in every time I shoot. With the rail folded it is pretty compact but very tall, so it doesn't really fit in any bag I have. When I put it in a backpack there is always a rail end sticking out somewhere.