This left only one parcel. Harry picked it up and felt it. It was very light. He unwrapped it. Something fluid and silvery grey went slithering to the floor, where it lay in gleaming folds...
"What is it?"
Harry picked the shining, silvery cloth off the floor. It was strange to the touch, like water woven into material.
"It's an Invisibility Cloak"
http://stretchingtheboundaries.blogspot.com/2011/01/invisibility-cloak.html