Food-Grade Safe Material: Each collapsible food container is crafted from, food-grade silicone, ensuring safe contact with all types of food for daily use. Leak-Proof & Fresh-Keeping Seal: Silicone lunch boxes feature a tight-sealing lid that effectively prevents leaks and, locking in food freshness for longer periods. Space-Saving Design: Collapsible food storage containers are made of food-grade silicone, foldable to 1/3 of their original size, easy to stack and store, perfect for limited cabinet, drawer or backpack space. Versatile Usage Scenarios: Silicone food storage containers are ideal for office lunches, outdoor picnics, or leftover storage, portable enough to take anywhere you go. Microwave Safe for Quick Heating: Collapsible silicone food containers can withstand high microwave temperatures (remove lid first), allowing convenient food heating to fit modern fast-paced lifestyles.