Here is a backpack add-on made to keep you cool and sweat-free in the summer. Thanko’s Backpack Cooling Fan stays between your back and bag and puts a breeze behind you. The fan is powered by a portable battery unit.
More gadgets like this: here
This backpack fan weighs only 405g. It can be powered by a 4000 mAh battery and runs for 4.5 hours.
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