How to carry knowledge? Books? iPads? Kindles? KNOWLEDGE seems to be extremely important for long term survival.
  
I want to be self-sustaining as much as possible and not have to rely on other people or living in a library.  
  
I would love a way to carry educational materials about farming, medical, navigation, construction, repairing, etc...
  
Keeping my bug out bag lightweight is important to me, so i'd rather not carry a bunch of books, etc.
  
How does everyone here do this?  
  
Is there a common device people are using to store guides/how-tos? Waterproof? Durable?  
  
Lastly, is there a good free resource online to download guides/e-books?  
  
Looking forward to the responses!