My loadout matches what I use with my real steal firearms.
HSGI Sure grip padded Belt
3x HSGI Double Decker Tacos (holds one rifle and one pistol mag each)
1x BAE Systems USMC Dump pouch
1x HSGI Blowout pouch (I.E. First aid) with shears and a CAT Tourniquet
1x HSGI Radio/admin pouch with a UHF or VHF radio depending on what comms are up on the field.
1x SERPA holster on an offset drop so I don't have to run a thigh rig
1x SOG Sealpup Knife
1x Blackhawk Flashlight holder for Surefire G2 (but will hold various types of lights)
On top of the HSGI rig which is my primary rig I will also run a slick plate carrier (Beeze Combat Systems in Multicam) that has a large velcro patch on the front that I'll stick a blue force gear 3 mag pouch on if I need to carry a bit more. I mainly use the slick plate carrier for rifle courses.