The Sunlinq weighs 360 grams and a 120 mm computer case fan Delta AFB1212SHE weighs 256 grams

Total weight including cables would be around 650 grams or about 1lb 7oz. Not to much to keep cool especially when you consider the amount of clothing and sleeping bag etc that is used to keep warm.

BTW has anyone tried out a Simply cool active neck scarf or Cobber body cooling neck wrap

Combined with a little water (if water is scarce) and active airflow 150CFM the combination of the neck scarf could be a reasonably lightweight (i.e. less than 2lbs weight) and efficient means of cooling down the onset of a 'crockpot brain'