A package system for maintaining the physicochemical integrity of the contents of the package system, the package system having, in use, a first bottom end and a second upper end and comprising: an outer bag having a first compartment and formed from a gas and/or moisture impermeable polymer material and having an interior, a side wall, a first end and a second end; a discharge port located at the first end of the outer bag and having an exterior wall that defines an interior passage, wherein the interior passage provides access to the interior of the outer bag; an inner bag forming a second compartment inside the outer bag, the second compartment formed from a layer of a gas and/or moisture permeable material having a first end, a second end and opposing side edges, wherein the side edges are sealingly attached to the side wall on the interior of the outer bag from the second end of the outer bag, and wherein the first end of the second compartment is heat sealingly attached to the interior of the outer bag at a point at least 4 inches (101,6 mm) above the discharge port to form the second compartment; a pressure equalizing port located near the second end of the package system having a passage extending between the interior of the inner bag and the environment exterior to the package system, wherein the passage of the pressure equalizing port contains one or more filter materials that comprise at least one desiccant or gas scavenging material; and wherein the first end of the outer bag is sealingly attached around the exterior wall of the discharge port, wherein at least one desiccant or gas scavenging material is disposed in the second compartment and the second end of the second compartment is sealed closed, and wherein the second end of the outer bag is sealed closed to isolate the interior from an environment exterior to the package system. an outer bag having a first compartment and formed from a gas and/or moisture impermeable polymer material and having an interior, a side wall, a first end and a second end; a discharge port located at the first end of the outer bag and having an exterior wall that defines an interior passage, wherein the interior passage provides access to the interior of the outer bag; an inner bag forming a second compartment inside the outer bag, the second compartment formed from a layer of a gas and/or moisture permeable material having a first end, a second end and opposing side edges, wherein the side edges are sealingly attached to the side wall on the interior of the outer bag from the second end of the outer bag, and wherein the first end of the second compartment is heat sealingly attached to the interior of the outer bag at a point at least 4 inches (101,6 mm) above the discharge port to form the second compartment; a pressure equalizing port located near the second end of the package system having a passage extending between the interior of the inner bag and the environment exterior to the package system, wherein the passage of the pressure equalizing port contains one or more filter materials that comprise at least one desiccant or gas scavenging material; and wherein the first end of the outer bag is sealingly attached around the exterior wall of the discharge port, wherein at least one desiccant or gas scavenging material is disposed in the second compartment and the second end of the second compartment is sealed closed, and wherein the second end of the outer bag is sealed closed to isolate the interior from an environment exterior to the package system.