A good choice for someone looking for flexibility is the Kammok Firebelly Trail Quilt. It can be bought with either synthetic or isolation down. This backpacking quilt measures 75in/191 cm approximately 52in/132 cm and has drawcords, snaps and elastic which enable it to be used as a standalone sleeping bag or bag cover for really cold adventures. Moreover, this bag has the benefit of being lighter and easier to carry, taking up very little space in your backpack. This bag should be used in temperatures dropping to 30 degrees Fahrenheit.