A yellow sack placed in front of a house in Lower Austria has a great chance of becoming acquainted with Thomas Mayer’s sack opener. The barbaric-looking machine, a rotating wheel with blades, slits open garbage bags here non-stop, six days a week. The bag opener, the size of a small car, is the first of many steps a water bottle, yogurt pot, or cat food can must take to become a water bottle, yogurt pot, or cat food can again.