I am playing a level 13 Fighter with the Sharpshooter martial archetype (from Unearthed Arcana: Fighter). I took the Sharpshooter feat as well, of course, and the Archery fighting style. I shoot between 3 and 6 arrows per round (using Action Surge and Extra Attack), so I need a lot of arrows to keep me going through combat.
A Bag of Holding seems to be best option for holding the arrows I will need; since I read this thread, I plan on using a box to hold the bundles - presumably 1 box per bundle to keep things organized.
What dimensions would such a box need to be able to hold 20 arrows?
I am specifically asking for the dimensions of a box that can hold 20 arrows because that determines how many boxes I can put in a bag of holding, which will equal how many arrows I can safely put in a bag of holding.