The Copia magazine carriers are premium, duty-grade, injection-molded magazine carriers designed for hard-use, daily concealed carry. Their innovative cavity design and retention system allows them to be used ambidextrously with the double-stack magazines of nearly 100 different handgun models chambered in 9/40/357.They are available in singles or doubles, and have a body-hugging contour which is not only more comfortable than traditional magazine carriers; it is also more concealable.