Compact Pouch for dropping of empty mags. Provide ability to recharge much faster, because you don't need to put empty mag back to the pouch.   

Compact model, fits 3-5 empty mags (depend on calibre). Have elastic cord inside, that allows, if necessary, to protect themselves from falling out of the contents of the pouch.   

Can be rolled up, to minimize size on your equipment. Can be used as pouch for storage something else, like gloves, bottles, instruments and etc.