I am assuming, Schmedlap, that the low hanging fruit has been picked for the other gear like it has for body armor. It really doesn't make any difference to the warrior whether the weight is coming from his backpack, hydration system, first aid supplies (for Corpsmen or Combat lifesaver), ammunition or body armor.

The point is that we can fiddle with the small stuff that won't make any difference, or we can attack the large stuff that will. ESAPIs are the gold mine. Fix this problem and you fix the problem of battle space weight.