Air Mail Launch

Standing on top of this giant cardboard package, I spotted a shiny metal clip wedged right beneath a yellow envelope sticking out of our mail slot. I pulled a long rubber band loose from the packing bundle, looped one end around the cardboard corner, and stretched the rubber tight across my palm. Aiming straight for the doorknob, I let go—twang! The band snapped forward, whizzing through the air and looping perfectly over the brass knob. Who needs stairs when you've got tethered zip-lines in the making?