1. No extra baggage charges: when you only pack carry-on baggage, it is much less likely to pay extra baggage charges, so that you can put the check-in costs elsewhere.
2. Don't over pack: By limiting yourself to carrying carry-on luggage, you can restrain your impulse to over pack and force yourself to pack only necessities. As long as you remember, anything you forget can be bought when you travel, so don't be too eager to take everything with you.
