Thanks to leak-proof technology, these containers provide a mess-free, spill-free food storage solution. The 2-latch design provides an airtight and secure seal to lock in freshness. They may look like glass, but each container is actually made of crystal-clear Tritan for a premium look. They also resist stains and odors, making them ideal for storing all types of food.Simply lift the container's latches to reveal vents for splatter-free microwaving. Now you can easily re-heat your leftovers without removing the lid.