These bags are great for sterilization use, and whether by accident or on purpose, I was actually given two 100pc boxes of these bags instead of one, which was very kind of them to do. I use these a lot to keep my soap and isopropyl bottles sterile and ready for use in tattooing environments. I would recommend also tying some rubber bands around the top and at the base if necessary so that the bag fits snug around the bottle to prevent contamination.