I bought a packet of biscuits yesterday. So far so good. I opened
the packet that evening to find not biscuits, but small foil packs
containing sets of biscuits. Opening the first pack revealed a
plastic tray containing three biscuits. I ate the biscuits, but
left the plastic tray.

Later on, I reached into the packet of foil packs containing
plastic trays containing three biscuits (each), expecting to find
another foil pack containing another plastic tray containing three
biscuits, but found instead a piece of folded corrugated cardboard
(like half a box) containing a foil pack containing a plastic tray
containing three biscuits. This is getting ridiculous.