I recently purchased a PL200 Stair wizard and also the extensions as an accessory.  Items were well packaged the stair wizard came in a 3.5" diameter tube the extensions came in a plastic bag.  I did have a time putting them back in the original bag but now that I recieved the PL200  put them all inside the tube.  The best way to get them in the tube is to pull the unit all the way out and put them in the center of the stair wizard and slide them in the tube.  The unit is designed very well it has black spacer blocks that are used to store the wizard. Do not lose them they absorb shock if you drop it. Definitely want to take your time removing  the unit from the package and noting where everything is located so you can reassemble and put it back in the tube. The wizard has rubber side bumpers to allow movement after setting is locked in place due to wall tilting inward.  The wizard can be used on other trim carpentry too like windows and other hard to transfer template layouts.  This item was very well thought out it saves a lot of time.  The speed in cutting the stair treads to exact size saves a tremendous amount of time!