what kind of disaster?
What kind of disaster could occur if I have my rod in the sock only and have a backup rod in case I break it. The lightest tube I have weighs nearly a pound and I don't need to carry any more pounds than I have to. I'd carry the backup rod anyway. If I break one because I slip, chances are good the other will survive. If I break them both, well, I'll just cut me a branch and catch fewer (maybe) fish.