Instead of using the common block construction, bottle schools use the non-biodegradable trash to construct and insulate the walls. Plastic bottles (found in excess) are filled with trash that would otherwise be scattered around the community.
The structure of a bottle school is not the bottles. Carpenters first frame the building while the kids and volunteers in the community gather bottles. The bottles serve to insulate the building and clean up the area.
The first bottle school project was completed out of 5,000 plastic bottles and over a ton of trash. The success of that project sparked interest in doing the same in nearby communities. In the past 2 years Hug It Forward has built 12 bottle schools with 4 more in