
In that case arrows are for people who run like hell and potshot the clearly out of your level range foe you have just pissed off.
But i think its fine as is. The people who play in 3rd all the time may notice it, but i play so many stealth toons, that i spend most of my game time in first person.(used to do the same thing in WoW sometimes on my rogue. Tried to pretend i was playing a Thief game). The only time someone will notice the backpack is if they use arrows a lot, and then suddenly run out in a fight and when they switch notice the loss. Otherwise the other half of people not using bows will never see it, and thus never know its not in place.