Flat stacks are great take up very little room in your cabinets and great quality
Everything about the Flat Stacks is great -- the fact that they take up less storage space in the drawers, and I don't lose the lids; the fact that they can be used in the fridge, and microwave and dishwasher; the fact they are made of food grade silicone that doesn't leach plastic into our bodies and food; and the various sizes and colors.
I bought some for my daughters for Christmas gifts, and feel good about giving them storage containers that won't harm their family's health.