Ideally, there is no plastics. It is glass (it gets washed and reused). The lid is ...a metal sheet or something? Also gets reused. That is the key idea, it is

Ideally, there is no plastics. It is glass (it gets washed and reused). The lid is ...a metal sheet or something? Also gets reused. That is the key idea, it is just a process towards that and in the meantime you got to reduce plastic usage somehow.