Rolf Potts, of Vagabonding fame, is currently making a trip around the world with no baggage.  It's called, appropriately, the "No Baggage Challenge".  Recently he wrote about a Thai train trip and meeting an unfortunate traveler with nine pieces of luggage, including one monstrous 60kg bag.  Go read his excellent article and then come and make fun of me for carrying too much stuff to Costa Rica.  Our next trip, we shall be packing much lighter.

However, unlike Mr Potts, I will still have at least a little bit of luggage.