At our office we have a dual garbage bin behind a door. Let's put aside the fact that you have to open a door, and then pull out the bins.
What has puzzled me is that the labels were placed on each side, while the arrangement of the bins is "front and back".
But my UX question is: if the labels were placed vertically, i.e. "top and bottom" then what would be perceived as the logical order, since the bins are "front and back"?
Translation: the top left label in the picture is for grey, the bottom right is for orange.
Update: I cannot add an image in a comment for Martyns reply below so I'll put it in here. Martyn said "Using the gestalt principle of proximity would give you clearer instructions. We perceive things in close proximity as belonging together. Put the label for the orange bin on top of the lid and the label for they grey on on the drawer."
That makes sense with the drawer fully open. Can still cause confusion if people don't expect a second bin behind the first one.