The 10 Essentials

 What are the ten essentials?

Why do you need them? You never know when an injury, even if not your own, can end your hike. Often you have to wait for SAR, sometimes into the night. These things can help you avoid an emergency or assist in an emergency. 

Another good one not listed is duct tape, its an important part of a repair kit and can be wrapped around your poles. Also can be used as part of first aid kit for splint making and as a large bandage in a pinch.