Lock & Lock's clever patented system uses four individual locking hinges and a silicone seal to make them 100% air and watertight. Perfect for storing food in the fridge or freezer or transporting between home and work. A large range of styles and sizes are available to choose from. Freezer & dishwasher safe. Microwave safe (reheating only). BPA free. Capacity: 350ml. Internal Dimensions: 6.6cm x 11cm