Produced wet towels? What is the reason that they stink overnight?

Towels in the case of humidity will change over time and moldy and stinky. Because the microorganisms within the wet towel will feed on the fibers of the wet towel, making the wet towel rot and stink, especially in the sealed state, for microorganisms to corrode the towel provides a good environment. So the wet towel is sealed up will stink.