One-way degassing valves have become a staple in the coffee and tea packaging arena. This amazing invention has given roasters great flexibility in terms of packaging by allowing freshly roasted coffee to be packaged immediately. Since our valves release the air within the bag without letting outside air back in, it keeps your product fresh and prevents your bags from bursting. Our standard valve locations are listed below. For gusseted bags and flat pouches, valves are applied on the front. For any clear/foil stand up pouches, valves are applied on the clear side. For all poly window stand up pouches, valves are applied on the window side.