DIY Tip of the Day: Plastic bag dispenser. Plastic grocery bags turn up everywhere these days, so you might as well corral them for reuse. Simply cut the top and bottom off a two-liter bottle with a utility knife. Make the hole in the top about 3 in. in diameter. Mount the bottle on the back of a cabinet or closet door with the 3-in. opening down. Stuff the bags into the bottle and pull them out as needed.