18 Inch Doll Coleman Cocoon Sleeping Bag. Your American Girl will be very warm and cozy in this “mummy” style sleeping bag. The pewter and pink two-tone satin sleeping bag measures approximately 22 inches long and about 11.5 inches wide. There is a zipper closure down one side that has a tab secured with hook and loop, to keep out any chill! The hooded opening can be adjusted with a drawstring cord that secures with a toggle clasp.