How to Tetris in the stow bag

My colleagues put the boxes on the left or right in the back of the bag and all the jiffyies on the other side. In this scenario the jiffies are sun the back. Then if another medium comes the out it on top or in front of the jiffies. Is this the compliance or my DS is doing things differently? I usually keep the medium boxes all in the back and jiffies in the front so the don’t get crushed. I do like this because an OPS the first days was tutoring to me like this, but he was there just few days as supervisor.