Poop bag locker

This simple design came out of necessity.   

My teenager has an issue with tying the small doggie poop bag, so i made this. 

Could be useful for people with fine motor skill difficulties  and/or simply if you hate handling poop bags.

just twist the bag and feed it through the slit all the way to the circle.  It'll stay closed and in place.  

Model is small enough and cheap enough to make a bunch for disposal with the bag.