One of the best ways to keep your meat from spoiling is to use a quality synthetic game bag instead of those heavy cotton/canvas bags. T.A.G. bags are the best on the market. They're lighter, more packable, breathe better, wick more moisture, and clean much easier than heavier cotton fabric bags. I did an in field test this year of the TAG bags vs. a couple of heavy cotton bags on a bull moose I shot and the results were hands down synthetic. The cotton bags got saturated and stunk, and they weigh something like 5x as much and don't pack worth a damn. I threw away all of my heavy cotton bags after that hunt and I won't ever use them again. You can get TAG bags here:

http://www.pristineventures.com/products_gameBags.html

AK Jeff