I carry a 50 yard spool of leader material in my bag, and a small Plano box with snaps and swivels in my jacket pocket.
Takes less time to tie up a new one than it does to untangle pre-tied coiled ones
Plus, I can tie a knot in 50# mono without digging out my glasses. Can't say the same for 65# Whiplash, or even 20# mono.