??Durable - Made of durable heavyweight polypropylene which makes this bento boxes strong and tough and can support hefty foods without bending or cracking, yet light enough to make carrying it simple and easy. ??Value Pack - 15 sets of 1 compartment 32 oz. meal prep containers with airtight lids. ??Fresh Seal Lids - Great as food storage containers for meal preparation or storing leftover meals. Seals tightly to keep food fresh, cold food cold and hot food hot. ??Easy to Open - Airtight overlapping lids which makes it leak-proof, and designed with multiple opening points to avoid spilling commonly when opening all at once.