Yes, you are allowed to bring your own snacks on a Carnival Cruise, but they must be packaged, dry, and unopened. Items like boxes of crackers, bags of chips, granola bars, or candy are perfectly fine and do not need to be declared. This is a common peer-to-peer "hack" for parents with picky eaters or those who want specific brands of snacks that aren't available at the onboard buffet. However, you are strictly prohibited from bringing "homemade" or fresh food, such as fruit, meat, or sandwiches, due to agricultural and health safety regulations at international ports. In 2026, Carnival has also clarified that "coolers" brought on board must be small (no larger than 12" x 12" x 12") and used only for medical needs or non-alcoholic beverages. While the ship provides 24-hour food like pizza and soft-serve ice cream, having your own stash of familiar snacks in your stateroom is a great way to save money and ensure you have something to munch on during late-night movie screenings on the Lido deck.