Since Archers now need Arrows, how about an arrow box?

I’m still lost on this magically reduced weight? And HOW does it make sense? Great idea on the case. Apply an id to each ammo, when used the case calls for the id, replaces the spent ammo, until emptied nice way cleaning up inventory. My one and only issue is what magical/depraved way are you getting this weight reduction and why? So players can skip out on the survival portion of having to make choices about what they carry? Or are we all getting a Bag of Holding when it is just some leather/hide sewn together? If anything it’d probably be a pound depending on the object made to carry stuff. You’d be adding weight…