A google search or two with plastic bags as the focus and we had a plan.
Frist thing we did was to iron plastic to check the reliablity of the Google search. Sure enough when plastic bags are wedged between two bits of newspaper the layers of plastic stick together.
Then there was a whole lot of cutting, ironing and stapling going on.
This version, below is still held together with a few bulldog clips but it works.
Now we just have to work out the shoes.