I absolutely love these glass storage containers. This set includes 12 containers of different sizes and shapes. There are 4 of each- square, rectangle and round. Each shape has multiple different sizes. I can always find the perfect size container for what I need to store with all of the variety. Each container has its own lid. The lids all have 4 snap down closures. They are air tight and spill proof. I can package up my leftovers or meal prep my lunches for the week. My favorite part about these containers is that they can be used in the freezer to freeze my food or used in the oven to cook my food. They have so many uses and save me from having to use multiple dishes. My food stay fresher for longer. Great quality!