Usually Yes. When your natural casings first arrive there may be some gas build up in the container, especially in hot weather. This can smell pretty strong. Hog Casings are naturally pungent in odor and is usually NOT a sign of spoilage. Usually all it needs is airing out. Leave the container open in the cooler for a while. Or, take casings out of the container and air them out. If it is really bad, rinse casings in fresh water, re-soak in brine and the smell will usually dissipate. For more information please refer to DeWied International’s website.