What is the difference between Pokémon "Sleeved" Booster Pack and "Regular" Booster Pack?

Sleeved booster pack does include a cardboard packaging who provides a layer of protection from scratches, bending, and other types of wear and tear that can occur during storage and shipping. Also, they are easier to wrap if it is to give as a gift and they are just perfect for Christmas stockings or to slip into a birthday card. There is no better chance of getting rarer or higher value cards regardless of booster pack type.