Over the (35+) years with my much-abused Krausers, they warped slightly on on of them, letting water get inside during heavy rain rides. I shot some Naughas and made some Naugahyde liners for the bags one fine summer weekend, solved it handily without adding even 1 lb to the whole setup. I then discovered they kept the exhaust smell out of my clothes in the bags, too! The Krausers, with their injection-molded aluminum frame, are the lightest of all hard-side types that I know of.