Makes a great pillow.
As the first reviewer said, this stuff sack makes a great pillow. The outer shell is made of lightweight nylon (just like the stuff sacks for the Therm-a-rest ProLite pads) and the inside is lined with fleece. The sack keeps your pillow (of socks/jackets/etc.) intact and the fleece keeps the whole thing from sliding out from under your head. In my opinion, it's worth the very slight weight addition.