Make sure they ahve good ventilation!
I was so excited about these little bags and bought the pair when I went to puchase my second round of Nolé hair care. It seemed like the perfect solution since towards the end of the bar they do get very fragile and break apart, so again I was excited to have a way to get every little bit out of the shampoo and conditioner bars!
Unfortunately, they got moldy :(
I kept the bar bags in my shower in between washes - which I do about every other day - but I think they must not have fully dried out and so they got moldy. I was surprised by how quickly it happened, about two months after I purchased the items. Perhaps if the fabric was thinner they would more easily/quickly dry out. But just know they it might be better if there is good ventilation in your bathroom if you are using these bags.