Let's say you're heading to New York City for a quick weekend getaway, and you want to bring a small duffel bag as your carry-on. If it's the right size, you'll be golden - you can stash it under the seat in front of you, and still have room for your laptop and water bottle.
But, if you're heading to Hawaii for a beach vacation, you might need a larger bag to fit all your swimwear and sunglasses. In that case, you'll want to make sure your bag is still within the size limits, or you might end up checking it and risking it getting lost or damaged.
So, the next time you're packing for a trip, remember to check the size of your carry-on bag, and make sure it's just right - not too big, not too small. Your plane-mates (and your sanity) will thank you.
