The airtight, leak-proof lids hold mess inside and keep lunch boxes, briefcases, handbags, and backpacks clean. This unique flat design is more compact than traditional food storage containers. They're ideal for school, work, the gym, kids' lunches, hiking, camping, and more. Made from BPA-free plastic, Joie's Bento Boxes are sturdy, durable, reusable, with microwave-safe bases for easy heating, and dishwasher safe for easy cleanup. Do not microwave the lids. Each measures 8.26" x 5.7" x 4.21"