When I decided to start training for a 100-mile (160 km) ultramarathon, I had little more than a pair of shoes as far as running equipment went. I quickly discovered that a sport technically requiring zero gear whatsoever - you can run barefoot and in the nude, after all - has available a lot more
Ultramarathon Packing List – Gear for a 100-Mile Run
An ultramarathon packing list isn't quite as complex and doesn't require much as packing for overnight backpacking, but it could be argued that the consequences are much higher. Forget something during an ultramarathon and it could ruin your entire race. Nobody wants to end up with a DNF (did not