I'm guessing it's for cleaning a collection of something small. You throw them in, zip it, and put the thing into your washing machine. Not sure what for, though - Could be pebbles, dices, loose teeth, etc. Keycaps, maybe?
Plot twist: It's actually really really large. You drive your car inside, and zip it. As you drive your car, the thing rolls around you and scrubs the car clean.
There's a reason clicking on random ads has led Google to believe that I am a rock climbing foodie black woman who hates my natural nose and dabbles in welding and CNC machining.