Possible Clues:

• Drying agent
• Shelf making space for one container that keeps things dry
• Common drying agent in packaging (see letters 6 to 8 in this answer)
• Drying agent -- all but illegal -- is manufactured without copyright
• Shelf holds one enclosure for drier
• Common desiccant
• Absorbent component of some cat litter
• It is used as a catalyst in many chemical processes