ALPS Mountaineering Poly Cotton Mummy Liner
32 in x 86 in
Here's what other sites are saying:
Instead of taking the time to wash your sleeping bag after every camping trip, use the Alps Mountaineering Rectangle Sleeping Bag Liner to keep the dirt at bay. Made of comfortable polyester and cotton, this liner slips inside of your bag to protect it from dirt, adds a few degrees of warmth, and can even be used alone as a light blanket on hot summer nights.
If you're tired of trying to clean the inside of your sleeping bag and it's constantly getting dirty, then the polyester/cotton ALPS Mountaineering Rectangular Sleeping Bag Liner is a great solution.