A 66lb, 3'x2'x2' box is not the easiest the thing to haul up a flight of narrow stairs (let alone get into a Civic). Nevertheless, I overcame adversity.
The giant metal staples holding the flaps of the box together fell to my mastery of a boxcutter.
My attempts to extract the bag from the box while maintaining the box in one piece, however, proved fruitless. That's at least a two person job. Thus:
Creating a small incision in the plastic bag containing the sac yielded an amusing hissing sound as the vacuum drew in air.
... and also led to an anomalous balance issue, causing the sac to list to one side....
The plastic bag had to come off. There was no other choice. IT HAD TO BE DONE.
Freed of the plastic bag, the beanbag looked cold. I brought it a jacket, but like an ornery child, it was not quite that easy to dress.
At this point, I discovered that I'd been trapped in the corner, and had to relocate a table to release myself. In retribution, I manhandled the beanbag until it was upside down....
... and taught the cursed chair not to screw with my anymore, or I'd rip the stuffing out of it ...
Luckily, it saw the reason in my words, and yielded.
Triumph!