One thing that came as a sad discovery is that the three (that I have found at least) portable storage containers are all the same size. For example Welmeti Storage Bin, Wasoe Storage Bin are excatly the same slots.
My suggestion would be that Welmeti and Poahoa (not a real object) make the best of one item, Someone (I call Welmeti a person - not sure why), else does the best of the X item, and so on and so forth.
I can see why they all have the same slots, but I think at least in my view, varied slots seem better than static slots with different looks.
What's your view?