The ECOtanka Poly Loop Lid is a plastic lid made from PP#5 which is considered to be one of the safest plastics for food. This lid is BPA FREE, it is also BPS & BPF FREE. (The industry removed BPA from polycarbonate plastics and changed to BPS or BPF which is just as bad as BPA! )
This lid can fit almost all bottles except the megaTANKA bottle.