A container assembly for retaining a moisture-sensitive material has a selectively resealable outer container defining a chamber, where a bond portion of an inner surface of the outer container is formed of ultrasonically weldable material. The container assembly also has an inner container having a humidity-control substance, where the inner container is disposed within the chamber. The humidity-control substance is in humidity transferable communication with the chamber. A bond portion of an outer surface of the inner container is formed of ultrasonically weldable material. The bond portions of the outer and inner containers are ultrasonically welded to each other to fix the position of the inner container within the chamber of the outer container.
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