The Faa has set some pretty cool rules to make sure everyone has a smooth flying experience. For instance, your carry-on can't be more than 22 inches tall, 14 inches wide, and 9 inches deep - that's like the size of a small backpack! But, why do they care so much about the size of your luggage, anyway?
Well, it's actually pretty simple: they want to make sure there's enough space for everyone's bags in the overhead bins. Imagine trying to cram a giant suitcase into a tiny space - it just wouldn't work! The Faa also wants to prevent any potential safety hazards that might come with carrying oversized or overweight luggage.
