As far as we use plastic liner inside cup, we can eliminate lid from the construction of the cup. How we will do it - by implementation of Zip locker. Plastic details can be welded to each other without any gaps, providing impermeability.
Amount of plactic which used in production of Zip Lock is significatly lower. That's why it impact directly to ecology.
Possible combining with separating plastic and paper layers can multiply sustainability of this solution. After separation both material are recycled and are forwarded to reuse.
The clasp allows you to quickly and tightly close the package with the product. It saves your beverage from spill and cooling.
The packaging is aesthetically pleasing. Design of the cup can be modified. What is essential - principle.