Sleeping Bag Liners are a great way to reduce wear and tear in your sleeping bag and help prolong its life. This soft Polycotton Mummy Sleeping Bag Liner from camping experts Trekmates is practical and durable, and will undoubtedly become a camping staple in your household. Designed in particular for mummy shaped sleeping bags, it comes with its own stuff sac for easy transportation and storage, and is easy to clean too.