These storage containers are the perfect match for your lunches! Made of an ABS ceramic plastic, these containers are virtually indestructible. Four reinforced locking points ensure a 100% leak proof & airtight seal. Containers retain their shape and hermetic properties regardless of microwave, dishwasher, or freezer use. Hermetic Food Containers Do NOT stain or retain odors, so go ahead and fill em up with your tastiest, sauciest, messiest favorite dishes. Use by itself or cohesively with any of the Nomad Collection Lunch Bags!