I absolutely love these bags. I use some as a pen holder, some to hold my medications, and others to hold makeup and hair ties. I have one that holds my travel sewing supplies so I can make fixes on the go. I don't have to worry about water ruining anything inside the bag. The different sizes allow me to pack up all sorts of things and they fit well in my backpack. I have never had trouble with the zippers, they work great! :) I will definitely will be buying these again.