When prepping it is easy to overlook something that may take for granted now and haven't considered in our planning. What if there was no reference material tomorrow. Say you and your family are in a survival situation and most of the survival techniques were in your head and your family was still learning. You get attacked and killed but manage to keep you're family safe for the moment. Would they be able to fill your shoes? Stockpile manuals, books, information on things you know and things you would like to know. I am planning to bug in but for those who are bugging out you could do the same on a memory stick although you risk losing everything or not being able to access it