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.
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