I know most GTA players will not agree with me here but this is my opinion.
When waiting for V to come I was really hoping they would skip the magic pockets this time and make something similar to Max Payne 3 with visible guns on the player. A more realistic carrying system where more guns and armour would also slow you down.
Kinda like this...
1-2 rifles (with sling on players back)
Different types of rifles or extra ammo could go in your PV kinda like in Little Jacobs trunk in IV.
GTA V loadout today is something more like this...
4 smgs, 2 Heavy Machine Guns
2 knifes, 1 crowbar, 1 baseballbat, 1 golfclub, 1 broken bottle
3 shotguns, 1 musket
1 RPG, 1 minigun, 1 grenade launcher
25 grenades, 25 smokegrenades, 25 sticky bombs
100ish types of snacks including 10 bottles of cola
Kinda silly in my opinion.
The Minigun and RPG is cool guns but Its lame to pull it out of nothing blast away then hide it and run like nothing again.
On a side note.
Tanks, jets and buzzard would be more expensive/hard to bring to the fight.
Spawn distance would be further apart.
Supers wouldnt have much extra storage, bulletproof tires or a bulletproof rear.
Vest wouldnt deplet as today.
Blips showing would depend on distance, stealth and noises.