My stuff is all USPSA.
For single stack I use Uncle Mike Kydex double with belt loops (I have a paddle for sd holster and mags, but hate it);
Production I am looking for a kydex double with belt loops, but have not found one yet (haven't look too hard yet either);
Limited and Open I use CR Speed Versa Pouch;
Revolver I use California Competition Works shoot-a-moon, but I'd like something a little easier;
Shotgun I use California Competition Works 4 shell holders (may try some 6 round holders yet);
And for the AR I haven't found a mag pouch yet. I have two 30 rounders locked together and haven't need more mags yet (I do throw one more 30 rounder in my back pocket just in case).