This reminds me of the Darwin beer can regatta.
Every year this is held at Darwin, Australia. ------ On the beach there is a social event where many 'vessels' are used (some even float), these boats are made by fixing together lots and lots of empty beer cans.
There is no shortage of them as many are emptied every day in Darwin's climate. There are races on the sands with people carrying their constructions.
A very good time is had by all. Quite a number of extra empties are produced during the Regatta as you would expect.