Cloth luggage is really quite durable, comes in several varying sizes, and is feather light.
Equally important, they're the cheapest on the market and yet offer the greatest amount of space. Try, too, to be a one-suitcase traveler. With a valpac, you simply hang up your clothes inside, and instantly have a suitcase with a convenient carrying handle. Most valpacs also contain extra inner pockets for shoes, underwear, or other soft goods, and they have a great deal of useful extra space on the bottom and along the sides.