Cryo-vac Poultry smell can be effected by Time, close to Use-By Date, Handling, not exactly as cold as it should be 100% of the time, Diet of the animal, and what it was Enhanced with by the processor. An Off smell that " Dissipates " a minute or two after opening the seal is no problem at all and very common. If the off smell persists or is gross smelling, the meat is spoiled and should be discarded. Case in point. Last night I was making meatballs with ground pork. The packs are hard plastic that they pack in a Nitrogen environment and seal. The sealing plastic is often taught but the first one I had was slightly puffy. I opened it and the smell was stronger than usual but not nauseating. I opted out and send one of the kids for another pack. When he returned from the store the new pack looked identical and when opened smelled the same. I set it aside and did the rest of the prep. When I got back to the meat, they both smelled very slightly off but the test patty was delicious. I used BOTH packs and everyone raved how good they were. So if the smell goes away, it's all good...JJ