If you have to check in your laptop while traveling, Pelican Case offers some of the best laptop cases on the market to safeguard your laptop while in transit. They are not light and they are not pretty, but they are secure.
The 1490CC1 Attache/Laptop Computer Case is watertight, airtight, dust proof, crush proof, and corrosion proof. It is molded of advanced ultra high impact copolymer resin, protects valuable laptop computers from handling abuse and all weather conditions. Unconditionally Guaranteed ... forever.
The case alone weighs 7.2 lbs, but it is big enough to accommodate even a 17" MacBook Pro.