RPET polyester (190T) drawstring backpack. RPET polyester (190T) drawstring backpack.(RPET – recycled polyethylene terephtlalate) RPET takes plastic that has already been created, usually plastic bottles, and chops the bottles into tiny flakes. These flakes are then melted to separate the core PET ingredient inside of the bottle that can then be turned into new products. Using RPET as an alternative to PVC is a huge step forward on the path toward a greener planet 100% recyclable.