Packing as few clothes as possible is the best way to go when traveling carry-on-only. This is because you can avoid carrying a lot of extra luggage, and it will be easier to pack everything you need in a smaller space. When packing for your trip, it is generally advisable to pack comfortable and versatile items. This means you should pack clothes you can wear in various climates, like T-shirts and pants. You can easily dress these clothes up or down depending on the occasion.