Comment by mountainofdeath

This isn't a new concept. NYC (among other cities) had networks of Pneumatic tubes to shuttle intra-city mail around.

For NYC: https://en.wikipedia.org/wiki/Pneumatic_tube_mail_in_New_Yor...

For Paris: https://en.wikipedia.org/wiki/Paris_pneumatic_post

It will be interesting if the economics work in suburban sprawl.