Sleeping Bag Liner, Mummy from Helsport is a mummy-shaped sleeping sheet that protects your sleeping bag and keeps it fresher for longer. Use the sheets in your sleeping bag for extra warmth or on it´s own when it is warmer outside. Storage bag included. Helsport Sleeping Bag Liner, Mummy (Poly/Cotton) Grey | Buy Helsport Sleeping Bag Liner, Mummy (Poly/Cotton) Grey here | Outnorth