This is for painters who use the Ultimate Handheld sprayer.  Occasionally, we need to invert the sprayer and set it down to clean out the flexible liner, or perhaps to change color.  I also invert mine when I clean it, which I do after every use.  You could fix it to the top of the gun, I just toss it on the ground, and slide the gun inverted toward the spray end.  Fits just fine.

This little helper just keeps it upright!  I called Graco, oh boy were they absolutely thrilled that I called them to share this.  Blink.  Blink.

Hahaha.