If you're new to the ultramarathon world, chances are the concept of packing a drop bag is also new to you. In traditional road races, you may have the opportunity to drop off a bag of gear for after the race, but what do you leave in a bag that is meant to be used DURING the race? In this beginners guide to packing an ultramarathon drop bag, we'll break down the entire process as well as drop bag etiquette to help make your next ultramarathon go as smoothly as possible.