What sets these bags above the rest is their ability to encapsulate odors, prevent their escape, and protect against water damage. The key to their high functionality is the custom system of layers used in each bag. The outermost layer is a rubber-backed nylon which is what makes these bags water resistant and also keeps odors contained within the bag. Working your way into the bag, there is a Dual Carbon Filter. These layers work together to filter out any unwanted odors. Lastly, they have a cotton lining. It is soft to the touch and also helps to protect the longevity of the Dual Carbon Filter. What also sets these bags apart is the quality materials; all bags have rubber-coated zippers, genuine leather accents, and metal hardware.