Although my crane bag is not bottomless, it does carry both cherished treasures and working tools. These tools are made sacred by consecration ritual and only used for specific purposes. The more the tools are used in their specif ways the more they hold the sacred energy of their purpose.
I use a simple ritual of cleansing, re-birthing and charging. I won't go into details here as I feel this process is intimate to each person and their objects.
I carried a crane bag before I had ever heard the term. As a child I wandered, explored and played in the woods and wild flower field behind our family cabin in upper Michigan.
I carried along a small crocheted bag with cloth lining on these adventures often finding interesting and special items to bring home. Of course this is something many children do and I believe that this is inherent in us, this unquestioning awe and connection with the natural world around us.
Crane bags and their content are as varied as those who carry them. Some examples are herbal tinctures, sacred stones, or herbs. Some may contain practical tools or items as well such as a pocket-knife for gathering plants, or other uses.
While my working tools always remain the same I have had other treasures that come not unlike the cycles of nature herself. These treasures have included rocks, twigs, roots, bark, nuts, feathers, bones, shells, teeth, and herbs.
The AODA has a bit more structered information for those who care to have a look.