From Recoil:

Deciding what to carry in a medical kit is highly dependent on anticipating the injuries and illnesses you may encounter in a given situation. It’s also dependent on the space available for your gear. After all, the space available when partaking in outdoor activities off the beaten path can be quite limited. You must eliminate unnecessary items so that you can carry other essentials. If you carry a gunshot trauma kit on your person or in a range bag, it’s even more essential that the contents remain compact and free of clutter from unnecessary items.