I don't field dress any more. I now use the gutless method and bone them where they fall. That way I get all the edible meat and it has three major benefits.
1) The meat cools quicker because it is in smaller pieces and it stays cooler since I can put it on ice in an igloo cooler.
2) The meat stays cleaner since I don't have to worry about stomach content etc...
3) The meat is easier to pack out since the hide, head and bones stay in the field. Most hoofed animals only have about 42% of their entire weight in edible meat. Why take out more weight than you need to?