These bag caps have two pieces. The inner ring slides over the top of the bag and the outer ring seals it while also acting as a recloseable top to the bag. This seems like slight overkill for chips and other goodies that will probably be eaten up quickly; a clothespin is more than enough gadget for us.
But for other bags of food that get used up gradually — like powdered sugar, rice and even some pastas — these seem like a great idea. If you don't put your powdered sugar into a container then this cap could make a bag less messy and more functional.
What do you think? Would you use these? We think they are a bit pricey, and we also have yet to try them, but we think they have some potential.
(Images: Sur La Table; Copco)