Use zip-lock packs
While packing your important documents, like passport, certificates, etc, keep them in a zip-lock pack, so that they remain clean.

Choosing the right luggage
Choosing the right luggage always helps you in carrying things easily. With the right luggage, you are always able to get through the security line much faster. Also, while selecting the luggage, keep in mind the baggage policies and the size of luggage as per the rules. While purchasing a luggage, look for some additoinal features like; hanger rods, extra pockets and durable locks that do not dangle much.

Carry comfortable shoes
Always include comfortable and good looking shoes or sandals in your luggage. Your feet will hurt if you don't have nice shoes to travel around. Usually, three pair of shoes are enough including a pair of bathroom slippers, sport shoes and a pair of formal shoes for social events and get togethers.