At the moment we've configured the vest space in this way:
number of magazine you see on the vest + 20 cargo space (20 is equal to 2 german grenade, or 4/5 US grenade more or less)
it could be changed, but i can't understand how a soldier could carry and store all that stuff
If you want more cargo space you can add a small backpack or a bigger backpack like the bergen.
We've to adjust a bit the cargo space of the uniforms, especially for the paras since they have more pockets than M37 and the M41.
We could tweak those values if you provide some tech info, but as you said, we don't want to re-create a one-man-army soldier