But buy the .45 double stack. 9mm cut outs too small - BenchMaster Double Stack 9mm Mag Rack, 12 Magazines

This is a simple block of foam, with cutouts for mags, both loaded and unloaded. Works great, organized my safe, protects the mags which had been loose all over the shelf, etc.
I bought .45 single stack, .45 doubele stack and 9mm double stack, all in 12 mag size. The .45 racks are 5 stars, best thing ever.

But...the 9mm double stack cut-out is too snug for either Glock or S&W 9mm mags. If I try to force them, the foam will tear. So, 9mm double stack rack....one star. No good. But just buy the .45 size instead, which tale .45, .40 and 9mm mags without an issue.