Thought these would be perfect for taking lunch to work. I thought they would fit the lunch bag better than round ones I have. These are heavier than the round ones, but that is okay. The problem I have with the product is the the slider that covers or uncovers the breathing hole falls out after a couple of uses. So with a hole in the top they are not useful for travel (might leak), and I can’t use them for lunches as I had planned.