I've packed in carryons for years. I can pack for a week in a small duffle. But there are issues - a big one is the lack of liquids. Its fine if I'm good with the hotel shampoo and am not bringing sunscreen. But for Disney, sunscreen usually pushes us over the edge.
We fly Delta and have a Delta AmEx that gives us free bags.
We fly Delta and have a Delta AmEx that gives us free bags.