I keep 100 feet of black in most bags, or green. and tan for a few depending which bag I use and where I am going. But for all I have 25 feet in orange. I keep mine shrink wrapped, keeps it all neat and compressed and packed. Should carry a solid 100 or break it up into more manageable lengths, why? Cause simply put, it doesn't weigh much. Buy a pack which is usually 100 feet from what I've seen, and just hold it, you'll see what I mean.
IMO more is better for this case, but beware of cheap cord, I bought a few from random surplus shops around here not to long ago and stress testing some, the really cheap cord BREAKS/SNAPs easily at around 100 pounds or so, at 25 foot length, the usa ones, I've tried hold up to 300+ I got lazy with weights, and seeing if it'd hold and gave up. But thats good, because, means it will probably take a whole lot more, stronger is better, and I really am trying to only buy US made stuff, if I can help it.