Make everything about your food storage purely better with this glass storage container set. Featuring a patented 4-hinge locking system for freshness that lasts longer, these storage containers are constructed from borosilicate glass, which can withstand both high heat and sudden cooling but is 10 percent lighter than tempered glass for easy, on-the-go use. Always BPA-free, containers are also microwave, freezer, oven, and dishwasher safe.