GOTE Gear has some reusable game bags that are very breathable. They have a hanging strap and the bone-out bag comes with a strap that can be used in the middle of the bag to separate the meat into...

http://www.gotegear.com/index.php?cPath=5&osCsid=e358e2c4f75bc76573cf6507ac4ddae2

I used these last year. Seemed very durable, breathed very nice, and washed up like new.