I know a guy that makes some. I believe other on the site has bought them.
He makes them for the Edge and 408 cases.
here are some pictures:
the case in it is a 7 rem mag with a 160 accubond seated to neck junction. It is actually the one for the RUM cases. My brother uses it for his 7 RUM.
I got one at wholesale sports that slides on your belt. it unsnaps and folds down with a capacity of 10 Rounds but works well. Not sure how it would work with Lapua's, they're a little wider. It barely fits 10 of my 300 RUM cases. It's suede leather and reddish brown in color.