18 inch doll cocoon sleeping bags. Does your American Girl love to camp out under the stars? She can stay comfy and cozy in this silver sleeping bag for 18 inch dolls. The “mummy” style sleeping bag features a side zipper, elastic hood and a front colored panel and trim. Your favorite 18 inch doll can stay warm and enjoy the outdoors in this 18″ doll sleeping bag. Comes in two color choices: Aqua and Hot Pink. The sleeping bag measures approximately 24″ long and 9″ wide.