The Eco-Connect Bottle System puts a threaded indentation on the bottom of the plastic bottles, allowing you to make a goal by screwing the bottles together. You connect the goalposts, crossbar, and other legs using a series of connectors. (Read this important safety advice about soccer goals from the Consumer Reports Safety blog.)
Beyond goals, Klein says the Eco-Connect Bottle System connectors can array bottles into grids that might be used as insulation in construction or to build temporary shelters to disaster victims. "If bottles like this were donated to a place like Haiti after a natural disaster, they would have material for shelters and building insulation, and the kids could make toys to play with," says Klein, who adds that plastic bottles and chicken wire have already been used to build a school in Guatemala.
Klein hopes that beverage companies will license his technology for use with their existing bottles and to develop their own custom connector kits.