CORE or the SUPERTOOL (aka SUPERTOOL 200)
They come in two types, one with a belt loop, the other with a clipon. I use them to carry the compact-size double-stack mags.
In ballistic nylon either one is $5.00 each, with a $5.00 s/h. I got 5 (3 belt loop, 2 clipon) for $30.00.
Leatherman Tool Group Inc.