Mixing up a big batch of soil and putting a bit too much moisture can lead to some stinky soil. I have yet to have a batch go anaerobic since I started putting PVC pipe segments into the dirt to let it breathe. If I have a big pile and a tarp I will Have some pipe into the middle core. Since I don’t really want bugs being attracted to my soil I like to put the lid on. As you can see I just drilled a hole through the lid. Anyhow hope this helps anybody else that needs it.