Ziplock

In the metro, like many metros, there are several vending machines.  The most recent addition at our metro stop is a Ziplock vending machine - ziplock bags!  It is SO popular!  We asked our Chinese teacher about it....apparently you can scan a code using your phone and qualify for a free box of the bags.  You enter the code into the machine to claim.  There is usually a long line but the contents of this machine were just replaced.  I'm sure it'll be empty again soon!  And in case you're wondering....IF you can find ziplock bags in Shanghai, they are very expensive!  We stick to tupperware or just buy the Chinese equivalents...