The premise of cult classic USSR movie Guest From Future [1] is that a boy walks for a kefir with the bottles for exchange and then gets into time travel advent

The premise of cult classic USSR movie Guest From Future [1] is that a boy walks for a kefir with the bottles for exchange and then gets into time travel adventure. [1] https://en.wikipedia.org/wiki/Guest_from_the_Future https://en.wikipedia.org/wiki/Guest_from_the_Future Some products like sourcream and milk were sold into buyers' containers. Which reduced amount of thrash significantly, compared to the "predictable availability" of today's world.