Food Bag Clip with a Pouring Spout and a Snap Shut Lid
Some guy on Reddit recently posted an image of a flour bag clip which his teenage son made for him using a 3D printer. Not only does it clip the bag, but it also has a pouring spout for neat pouring and a screw-on cap that closes the pouring spout shut to keep the flour fresh. The clip can also be used for other bags such as coffee bags, cereal bags, etc.
That being said, if you don’t have a hardworking teenage son, you can buy something similar on Amazon.