A simple storage tower I use in most builds with room for a Dimensional Depot in the middle. The front end has a merger you can connect an output to, the back end has a splitter you can connect the depot to. Build uses Mk. 5 belts since I haven't unlocked 6 yet, but it's simple enough to build that you can make your own if you don't have Mk. 5 belts unlocked. One thing to note if you build your own is there are conveyor lifts on the back side of the build too.

Can be used as a final product storage unit, making sure you never run out, or as an insanely massive item buffer.