I guess I should. I just used "Vent Screening", you get from Lowe's or Home Depot. It's used to block vents and such from birds, leaves, bugs...etc.
Made of fiberglass and basically just cut a 6" X 4" section. Or, whatever size you desire. Once cut, simply folded it in half and super glued the other two sides. Doing this, 3 of the 4 sides are joined and the other side is open. Kind of like a pouch. Place the food in the pouch and insert into a veggie clip.