Guitar bags for sale here - an excellent alternative to a hard case - they are soft, light, easy to carry and have rucksack style straps so you can carry them on your back.
Most have loads of pockets for your cables, tuner, strap or even your MP3 player! Mojo is a top quality brand making stylish cases with decent zips and offering excellent protection for your instrument.
Sometimes called gig bags, they come in all different shapes, sizes and thicknesses to accommodate different instruments. Generally the more you pay the better the protection will be as the soft walls of the case will be thicker.
Some are recommended for taking your guitar to school, work, lessons etc... However, they probably aren't recommended for overseas traveling with as they could get damaged quite easily.
If you're a gigging musician and are taking your instrument to venues regularly then a Hard Guitar Case may be more appropriate.