Any time anything is added to the pass through, space becomes even more limited. My pass through is narrow, it's not wide like some. Adding anything that attaches to the walls or hangs from the ceiling rafters reduces precious usable space.
I have found that using straight clear plastic containers with snapping lids to be the most effective for my use. Anything container with a taper or a rounded edge reduces storage space. Square and straight utilizes the most space.
I have several containers that stack on top of each other. They are clear and each container is dedicated for a different function.
On the other end of the pass through I keep my folding lawn chairs and outdoor end tables and such. Again, my choice of lawn furniture was a careful selection, to ensure as much as possible, every item nests inside another item as much as possible.
Yes, once everything is loaded, my pass through is jammed packed, and things are stowed away tight. It is a challenge to dig for a specific item when needed, but having everything of like functionality in their own dedicated container helps eliminate the guess work. And using clear containers helps see what each container actually holds, making it easier to find that one specific item I'm needing. And yes, things have to be removed, and then repacked. This is another reason to review how much stuff is actually being stowed away, and every trip (which mine are 3 to 6 months at a time) is adjusted.
That's how I do it.