Aluminum Foil Flat Pouches For Drip Coffee Packaging Three side seal pouches. A bag sealed on three sides offering a simple, cost-effective solution for large or small quantities of product. These pouches are a cost-effective solution, ideally suited for extending the shelf life of most food products. Our current options include a non-barrier and barrier 3 side seal pouch featuring the following benefits: Excellent barrier to moisture multi-layer structure FDA product compliant for direct food contact