TRADITIONALLY THE MEDICINE BAGS ARE FILLED FOR YOU BY A SHAMAN OR MEDICINE MAN, BUT YOU CAN ALSO FILL YOUR OWN. THE SELECTION OF ITEMS FOR YOUR MEDICINE BAGS NEED NOT FOLLOW ANY IDENTIFIABLE "LOGIC." IF YOU FEEL SOMETHING SHOULD BE IN THE BAG , PUT IT IN. USUALLY YOU WILL TAKE OBJECTS OUT AS YOU ADD NEW ONES. IT SHOULD NEVER BE PACKED FULL AND OVERFLOWING; YOU CAN'T CONCENTRATE ON TOO MANY THINGS AT ONE TIME. 
YOUR MEDICINE BAG IS A PART OF THE STORY OF YOUR SPIRITUAL LIFE. THE SELECTION OF ITEMS TO BE INCLUDED, AND EVENTUALLY UNDERSTANDING WHY SOME OF THEM ARE THERE IS ALSO A PART OF YOUR JOURNEY ON THE MEDICINE PATH. THE MEDICINE BAG IS FOR VISION, PRAYER AND SPIRITUAL ENERGIES.