This ring-shaped handle for a trashbag supports You, while collecting trash outdoors. 

You can wrap around the trashbag and secure the outer ring with a rubber band. So the opening of the bag is always open and doesnt wobble around all the time, and it's a good handle to hold the bag. 

Print both parts, PETG recommended, set perimeters of the outer ring so high that there is no infill left. 

It fits standard (prusa) buildplates, but if You have a bigger one, scaling it up in X-Y direction should work, and be useful.