It is possible to carry everything you need in your backpack?

We say YES!
We did some research and we love the advice of Business Insider, a site that is not categorized in style or fashion, and that summarize what is really worth having in your bag or backpack. We selected 12 things that will prepare you for anything. 
WHAT TO CARRY IN YOUR BAG BACKPACK
 
What is in your bag?
;)