Our glass bento boxes are made from borosilicate glass which is more resistant to thermal shock than the more common soda lime glass. They are dishwasher, freezer, microwave and oven safe, up to 400℃. For an added layer of protection, we added a colourful silicone sleeve to reduce the likelihood of shattering when dropped. The airtight and leakproof lid has a silicone seal to lock in freshness, avoid freezer burn and prevent the glass containers from spilling and making a mess in your fridge or lunch box. Total capacity of 24.9oz / 740ml, comprised of a 10.1oz/ 300ml compartment plus a 14.8oz / 440ml compartment, separated by a glass divider. Our meal prep food storage containers are great for at home, travel, on the go, gifting, lunch boxes, back to school and more!