Name 5 indispensable things to pack for a Latin American trip?

Help me brainstorm what to pack! This is a several month long backpacking trip spanning Mexico to Patagonia, so absolute necessity, weight and multi-function is important. Try not to repeat what has already been answered by someone else... if you can! Thanks.

Name 5 indispensable things to pack for a Latin American trip?
A small unimpressive frameless UL backpack, a backpacking hammock so you can sleep anywhere, rain or shine, jungle or village, without worrying about insects or what's on the ground, a compass, a water purifier, a big knife like a golok.


http://www.rayjardine.com/ray-way/Backpa...


http://hennessyhammock.com/


http://www.rei.com/product/738795


http://www.ebladestore.com/knives/BA2GWB...



Reply:condoms, bug spray, clean underwear (if you wear them), a passport, return ticket to your home town, a good attitude, and a camera.
Reply:Insect repellant


Phrase Book (Spanish and Portuguese if you are also going to Brazil)


2 changes of clothing


water bottle


camera