Be prepared and no worries!
One medium size luggage is good enough, remember that you may want to buy local artisans' work and those are normally made of wood. There is no problem with people stealing your belongings like in Santiago, so relax about a carry on backpack when you go on excursion. Dont' take expensive luggage, they may get dirty or dusty. Try to get light and easy to wash/dry clothing. Because of humidity clothes don't get dry easily so make sure not to carry heavy woolen sweaters. One or two wind breakers, a rain proof poncho or rain proof light jacket and at least two pair of good trekking shoes or tennis shoes. Several pair of socks are advisable too. An umbrella may help you in case of emergency, it was very useful for me so at least my head did not get wet! Take your own medication, even if you think you will not need it. Also women, take your tampons, lotion, tylenol and midol, band aids, and...
