This bento bag is composed of oxford cloth and thickened aluminum foil material, which is suitable for a variety of scenes, such as company, school, factory, outdoor, fishing. Keep warm for 3-5 hours so you can eat hot food when you go out.Orders of 800 pieces or greater are eligible for sea shipping. 100% guarantee for quality.The price for quantities of 2000 pieces and above is the price of sea freight.