eco products eco-products compostable vanguard 6" clamshell sandwich containers, case of 500, to go food burger box, white renewable molded fiber, grease resistant, no-added pfas, astm compliant, bpi-certified 6" x 6" is up for auction in Home & Kitchen. This item is in New/Like New condition. Bid on this item at our Florence - Industrial Road location before the auction closes.