Cocoon Nylon Stuff Sack with Fleece Lining (Black, 10-Inch x 18-Inch) Shell: 100% Nylon Lining: 100% Polyester Imported Pillow Stuff Sacks are versatile Nylon carry bags for all your necessities. They also reverse to pillows when turned inside out. High-quality polyester fleece linings protect your gear and are comfortable against your head when used as a pillow. Drawstring closure with cordlock secures items inside the bag.