The Pyrex Cook & Go food containers are ideal for preparing and storing meals in advance. The containers are made from shock resistant borosilicate glass. Cook & Go containers are dishwasher safe, meaning keeping them clean is easy. In addition, these containers are oven and microwave safe to 300°C (glass only) and fridge and freezer safe to -40°C. The Pyrex Cook & Go food containers are made from shock resistant borosilicate glass for extra strength and safety. Complete with clip on lids for a leak proof seal these storage containers are ideal for preparing meals ahead of time. Suitable for use in the oven, microwave, freezer and fridge these Cook & Go containers are perfect for everyday use.