A container (10) for particulate desiccant (12) comprises a cup (14) and a cap (16). The cup (14) includes spaced inner (18) and outer (22) wall portions connected by a transverse web portion (24) to define a chamber (26) having an opening (28) for receiving the desiccant (12). The chamber (26) side of the transverse web (24) includes peripheral (86) and central (88) flanges, or energy directors, to which a first ply (74) of permeable lining material is ultrasonically bonded. The cap (16) is designed for receipt in the chamber (26) to cover the opening (28). In addition, the cap (16) includes peripheral (62) and central (64) flanges, or energy directors, to which a second ply (76) of permeable lining material is ultrasonically bonded.