I have a sturdy black leather key case, it's exquisitely made and looks great. However, please do your best to prevent mold from infecting your products. I wiped the pouch several times (inside and out) with a cloth lightly dampened with very hot water mixed with a little tea tree oil. I then placed the bag in a clear plastic bag along with some cotton balls soaked in tea tree oil (the cotton balls DO NOT TOUCH THE BAG). I sealed the bag tightly and left it on a sunny windowsill all day. It worked but I'm going to put the bag in another plastic bag in the freezer and then back out in the sun for a few hours because it's still not perfect. How many of your clients will do all of this... and successfully?