Stand up food bags are resealable, Food Safety Material. Three tier design make it stronger.The one way valve is to prevents the coffee beans from oxidation and keeps the food fresh, block light, keeps coffee from odor or moisture,ensure the taste of coffee or powder in the bag, and can also be transported over long distances. It also to store other nut snacks and so on. Commercial use, you can attach your own brand label on the surface as a retail or sample display package.Customized is available.