Store cut onions in the onion saver container to keep onions fresh longer. Using the onion keeper will reduce food waste as your partially used produce will stay fresh longer and will be easily found in a crowded refrigerator. Meanwhile, onion odors stay trapped, keeping your fridge smelling fresh and looking organized. For some fun when entertaining, use these as serving pieces for burger toppings, etc. Everyone will know where to find the sliced onion rings, for example. These reusable food containers contribute to sustainable lifestyle by cutting down on the need for wasteful disposable wraps and bags. The two sides attach by twist lock and are easy to open and close. Each is dishwasher safe, making cleanup a breeze! As always, each is BPA free.