bong mods is the term used when you modify a bong (usually a smaller one) to make it work better or just to change the way you hit it. commonly used bong mod materials are water bottles, clear tape, masking tape, pens, and toliet paper rolls.
*Adding paper towell rolls to small bongs to make the tube taller creating a awesome bong mod!
*Adding a self-lighting device
*Vaporizing system bong mods????
the possibilities are endless!