Using this cat food is easy. Just measure the appropriate amount according to your cat's age, weight, and activity level and serve it in a clean bowl. Make sure your cat always has access to fresh water. As for the packaging change, don't be surprised if you get a new or old bag. It's the same great product inside. Remember, this food is only for adult indoor cats aged 1 - 6. Don't feed it to kittens, or cats that are pregnant or nursing. Store the cat food in a cool, dry place. Keep the bag sealed when not in use to maintain freshness.