Modfamily has made a very simple and easy to use product. You can use these on canned veggies, pet food, pop cans and more. I used mine on canned veggies and pop cans. It actually kept my soda fresh after being open for few hours. I think these are so cute and they look like little turtles. These are pretty handy product that has kept me from using so much aluminum foil and plastic wrap. I would consider purchasing the larger ones and would recommend these to others looking for an alternative. I received this product for free in exchange for my complete and honest review.