I just went with cheap, plastic ammo cans for the pistol magazines. Each platform has its own can and I used blue painters tape and a sharpie to mark the cans to avoid confusion or grabbing the wrong can.

Rifle magazines are larger obviously. I have some of them in these?.

https://www.midwayusa.com/product/939360569

The rest of them are stored in fifty cal ammo cans.

Whatever you do, just mark each container so you don?t get to the range only to disappoint yourself.