Yes it's winter and the talk goes to how to stay WARM, but I ran across this fan for a notebook cooling fan powered by USB ....given the number of battery boxes with usb ports for recharging cell phones that are on the market today my mind immediately went to use of this fan as an air circulation device for summer Hammock camping..and the PRICE seems reasonable...

http://www.goldengadgets.com/gadgets...ooler-pad.html