I am planning a three to four month backpacking trip in Peru, hitting the Incan Trail, Arequipa, Huraz, Lima, Cusco, and El Misti (a volcano in Arequipa). It will involve trekking, light and heavy trail backpacking and some light mountaineering on El Misti. What do you think I need to take and has anyone done a similar trip. I am thinking about the Arc'Teryx Bora 80 pack (around 4500-5000 c. in.) and a three/four season convertible tent. Any other ideas/suggestions?