Cozy hanging sack with seat cushion. This hanging sack for children is equally impressive indoors and outdoors. Simply attach the hanging cave to a tree in the garden or to the ceiling in the children's room. Whether gently swaying, flipping through a picture book, or taking a breather after playing, your little ones will love hiding in the swing cave. With the seat cushion, it’s especially cozy inside the sturdy polyester swing sack. Note: The swing sack should be securely fastened to stable objects using the hook.