Promix 3.8 ...buying online how big does it ship?

So the promix 3.8cu bale should be around 18x18x18" if my math is right.

Since I am considering buying this online from amazon I am curious how big the box it has arrived in has been for most people... Or does it god forbid ship without a box? Just curious since I don't want to order a massive box since It will be going into a cramped office fora while for delivery.

Pretty sure everything from Amazon goes into a box..
No clue as to its size though..

It's big. Two feet by 1 1/2 by over 1. And heavy, too.