Here are some reference pictures if Molle doesn’t work a hook and loop closure on the back and clips could also mount this to a plate carrier. If Molle quick sticks are used it would be 6 straps and 3 rows like I have in picture
I am a terrible artist I can barely draw the most basic things so I am going to do my best lol so the back of the bag would be hook closure then you could attach an optional hook closure Panel to it which would contain on the opposite side a Molle panel which would allow you to attach it to either a backpack or inside a pack with Molle or a Molle insert etc you could also make another panel with a double belt loop on one side hook closure on other this would be an additional piece to the bag so it’s scalable to covert or less covert when used on carrier also double hook closure panel could Velcro it to the concealable soft armor vests too tons of possibilities
I tried to illustrate the front pouch opened. The back of the front pouch when opened could have a clear vinyl sleeve about the size of an iPhone to fit cards a map or a phone then the inside back pocket will have some sort of nylon pocket or meshed netting the idea for this is a place for ABD trauma dressing or combatgauze a triangular bandage swat-t or emergency/Israeli bandage on one side then the other for Hyfin chest seals and headlamp then a pen sleeve for a spare sharpie (CAT TQ shears and sharpie should be outside of pack for quick access) but users ultimately can use this as a junk pouch
The inner front pouch should have a bungee stitched for retention of extra tools and magazines the back of the pouch should be a clean hook velcro for attaching a loop closure EDC Pistol holster or Velcro mag pouches
The final back “mag pouch” pocket will have bungee strap retention for mags and bungee cord for open top retention. In the second and third reference photo are the attachment points for the top retention bungees they are ran through this small black tab then to the back through the Molle panel.