The crossword solution for the term CLOSED, AS A SLEEPING BAG is ZIPPED. This term refers to the act of closing a sleeping bag with a zipper, which is a common closure method used on many types of bags and clothing. Zippers are made up of two rows of interlocking teeth that can be opened and closed by pulling a slider along the track. Zippers are a convenient way to keep items securely closed and are often used on sleeping bags to keep out drafts and maintain warmth.