Long term Travel: Choosing the right backpack

You have many options when you're traveling depending on how long you're going for, what type of travel you're doing, where you're going and the weather. Since I plan on being gone for 6 months through rain and sun, cold and warm, I need to make sure I have enough room to have clothing to fit these options as well as enough shoe options for all of the above. Here are my favourite options for Long Term Travel!