If You can get Your Deer to the Processor that fast...why worry about keeping it cool?I shot a Buck in 2006 in October one time...it was still pretty warm out and since it was Bow Season most places weren't open late that evening so I ended up Field Dressing it right at dark then I brought it home and laid it on some clean cardboard in my garage and I stuffed 3 big bags of ice inside its cavity.It did fine til morning since I cooled it down then I took it in to the local Proccessor to have it skinned and cut up!