These containers are great to bring along for your meals, snacks and picnics. When empty, collapse them for easy storage in your bag or kitchen space. Great for camping as well! To microwave food, just pop-out silicone tab on the lid to open vent. Each set comes in 4 different sizes: 350ml, 540ml, 800ml, 1200ml Dishwasher safeMicrowaveableFreezer safe Pick your favourite colour.