One modern material that shows up in a surprising variety of guises is clear PVC. Clear tubing is ubiquitous in hospitals in the form of IV or glucose drips. It features too in the beverage industry, in the manufacture of plastic cups.
Corrugated clear PVC sheeting makes a durable carport or greenhouse roof. Do not forget to pick up a clear PVC tablecloth if you have a beautiful outdoor table you want to protect and show off.