Lock&Lock BPA Free Rectangular Stackable Container Set with Silicone Sealing and Interlocking Flaps, 3-Piece, 2-1/2-Cup, 20 Fluid Ounce Space saving interlocking system - adjustable as needed and maximized use of space Airtight and watertight with silicone sealing and interlocking flaps Made from highest quality bpa free material for strong durability and safety (microwave, freezer & top rack dishwasher safe) Multi-Use: Great for craft supplies, hobbies, hardware and small parts Ideal for storage of both dry and liquid contents