My experience with "just in case" things I take on trips is that they become a distraction. The best trip I ever had was one in October where we went to a hotel on a remote island without any internet and absolutely no phone reception.
We had almost the same experience month ago, when we traveled to Cape Verde. No internet and calls were so expensive that I only did one phone call during the trip. It really was refreshing!
It's called relaxation apparently. I liked it.