Is this for work or training? If for work...what role? LE/MIL?
When I was running dual comms, AN/PRC-148 left, AN/PRC-154 right, four rifle mags, one pistol mag, one multi-tool, hand held flashlight in small pocket on left side radio pouch, map markers jammed in small pocket on right side radio pouch, flat pockets to left and right of pistol mag pouches hold MS200 strobe, note pad/cards, (map pocket on back held cheat sheets and GRGs) and DAGR...placed a horizontal TQ pouch underneath (attached to webbing), IFAK is on waist in old EMDOM fag bag.
If for work, keep in mind that this (or any chest rig), either stand alone or attached to your PC should hold what you need to execute your mish RIGHT NOW...lickies and chewies, small arms parts, etc, etc go in your sustainment load
If it's for traiing...fill those pockets with what you need to shoot with, then the rest of them with Skittles...