Nap sacks are a type of bag that is used for carrying items, usually for outdoor activities such as camping or hiking. The term 'nap sacks' can also refer to sleeping bags. The crossword solutions for the term 'nap sacks' are COTS (4 letters) and BEDS (4 letters). COTS stands for cot, which is a portable, lightweight bed typically used for camping. BEDS stands for sleeping bags, which are large, insulated bags that are used for sleeping outdoors.