@tony Airing out your sleeping bag is a smart idea! If you Google half moon hangers it will pull up some options for you.They are different than the hangers you will see in our stores but you should still find something that meet your needs.
Another thing you might want to think about is buy some sleeping bag liners. They help to reduces odor and prevent some of your bodies oils, sweat, and dirt from contacting the inside of the bag. This increases the longevity of the bag. I went with this option because it is way easier to wash a liner than your sleeping bag.
Hope this helps!