Everything goes into a single backpack. Bring as little as possible, only what you need. Buy your toiletries (toothbrush, toothpaste, deoderant) when you arrive

Everything goes into a single backpack. Bring as little as possible, only what you need. Buy your toiletries (toothbrush, toothpaste, deoderant) when you arrive at your destination. If the airline has a mobile app, use that to check in at the earliest possible moment.