Loot from dead soldiers can be stacked and difficult to sort through in the heat of the firestorm. Note: Game supplied loot on the map does not have this issue.
There are three basic kinds of loot. 1) Ammo of different types 2) guns 3) gadgets
To eliminate this problem:
When you loot dead player, HOLD X (Xbox) to 'auto loot' then the game will top off as much as possible any ammo in slots that you have already. It will add to gadgets slots not max'd out, like rocket launchers or grenades, med kits or armor, etc. It will upgrade any backpack or armor. All these items will disappear from the ground leaving any guns and previously not picked up gadgets or ammo. Discarded items will be tossed a bit farther away from the original loot pile as not to overlap remaining items. You then can then easily pick thru (quick X press) the remaining items to upgrade any gun or make other changes. Note: Any empty slots will still have to added to manually before auto loot will complete the slot fill.
Even this press-hold X is optional, you could just get into proximity of the loot pile for the auto-fill to engage as long as you have slots partially filled. Even if only Ammo was auto filled, that would help a lot.