Stackable, versatile & easy-to-use food storage container boxes made with durable plastic. The plastic boxes are Phthalate & BPA free. They are microwave (without the lid), dishwasher (top rack), fridge and freezer safe. The 6-piece storage system is easy to stack and lock with quick & simple clips made from silicone to seal each lid for freshness. The packsâ€™ capacities are 2 x 200ml, 2 x 400ml, 1 x 1L, and 1 x 2L.