RE: Field Dressing Question - Keeping Cool
A friend of mine recommended rinsing out your used gallon milk jugs and filling them with water and freezing them. Then throw those in the back of your truck when you head out. When you bring your deer back to the truck put the frozen water filled gallon jugs in the chest cavity. You could use 1 liter and 2 liter soda bottles as well and stick those into tighter spaces like between the Hams as Bigway suggest.