Quote Originally Posted by B Cart View Post
, and I always have a lightweight water filtration system like a Sawyer with me. I also keep a headlamp and spare batteries, a ; )
Be careful with Sawyer (and as far as I know any other filtration system) in freezing weather because if they freeze they are usually toast.

lithium batteries for headlamps are a good idea due to not rupturing out of the blue and not being as finicky in cold weather as alkaline. May not be a big issue now, but in the past not all lights could handle the output of a lithium so it is a good idea to check.