Amphipod Race-Lite Go Holder
This belt is designed for runners, particularly competitive runners---it allows you to wear your race number bib off the belt (comes with two brackets to hold the safety pins) rather than puncturing your shirt or shorts with safety pins in order to wear the bib.  The pocket is really designed to hold maybe a single car key, a sports gel or two, a little cash or a credit card, and perhaps an extremely light and thin cellphone at most.  The pouch being small and light does not bounce if you do not overstuff i