Today, i have presented in my "speaking" class about Backpacking. Its easy to make, i have give one source from the Wikipedia, and the rest i have write directly from my thought.Despite i don't have much experiences about backpacking, at least i have been travelled to Meratus Mountain, its about 150 km away from my house.
This is free stuff, you can use it on your class to give a presentation. I have used Microsoft Powerpoint to make it., you can modify this file but don't remove any credits in this file.
Download link is here: http://www.mediafire.com/view/?7yhufp2o8mf1z89