Possible Clues:

• Sit up for Susan's wipers
• Fabrics one may want when suffering from cold
• All in the box is the property of the girl
• Fragile papers
• Thin skins or papers
• Not a bit thick that it seems to be Susan's property
• Not a bit thick that it is the property of Susan
• Sheets of very thin paper
• Flu sufferer's handful
• Kleenexes