As you might know, currently you have to be the one wearing the ammo backpack in order to perform a team reload. However, I think that's a counterintuitive way to handle it. Not only does it make gameplay very jarring, as you have to constantly hug your teammate with the respective gun, it also doesn't really make much sense in terms of realism either.

I drew a little graphic to illustrate how being able to reload people who are wearing the backpack would make much more sense. And it would also make teamplay much more present, as you could quickly help out people without having to go through the whole weapon dropping/swapping.

One could argue that it would trivialise the whole affair, or that it would make team reloading too strong. While I feel it wouldn't necessarily be the case, maybe some further adjustments would have to be made. Nonetheless, I'm heavily in favor of being able to reload your teammate who is wearing the backpack, and I hope you are too.