I read this one in outdoor life magazine; You quarter your deer, put in in game bags. Then put them in garbage bags and insert some plastic tubing in the end for air and tie the garbage bags with the tube sticking out. Then you can submerge the quarters into a lake to keep them cool. The tube lets air in and the internal game bags keep flys out. It is for temporary only but could buy you some time untill it is cool enough to pack out. Good lick!