Feather River College's Outdoor Program Coordinator, Rick Stock, has a very useful Grand Canyon boat packing adage. "A raft is never full," he says. You can always throw another item into a gear boat so take advantage of the space. "Make sure you have a spare of everything you rely on," says Flett. He maintains that you will rely on sunglasses, flip flops, and sunscreen. Also, over pack with fun in mind. "If you want to have a costume party every night, then do it, pack six costume bags if you need to," says Flett. If you drink alcohol, double the amount of booze you planned to consume on the trip. "You only run out once," says Flett.