Keeps cut onions fresh, longer. Traps onion odors so that your fridge stays fresh-smelling. Prevents your cut onion from becoming lost and forgotten in the fridge. Fun for serving onion slices as burger or bagel toppings. Easy to open and close, the 2 sides attach by twist lock. Contributes to a sustainable lifestyle by replacing the need for disposable wraps and disposable bags. Dishwasher safe. BPA-free. This comes in a case of assorted red and yellow onion keepers.