Every time I read Vernor Vinge's _Rainbows End_ I find myself wishing that someone would invent Up/Ex --- big pneumatic cannons which fire disposable cardboard

Every time I read Vernor Vinge's _Rainbows End_ I find myself wishing that someone would invent Up/Ex --- big pneumatic cannons which fire disposable cardboard gliders into the air; they glide down autonomously to the delivery site and then you tear then open and remove the package. Last mile delivery. I don't care that it probably wouldn't be practical, or feasible. They'd still be awesome.