Lightweight and warm - Sea to Summit Reactor Plus Thermolite Liner - Compact

Love this little liner bag! I use it with my Disco 30 and it definitely makes a difference. I'm not sure I'd say it provides a full 20 degrees more warmth but for me it takes my sleeping bag down another 10 degrees easily. It's super thin so I just store it with my sleeping bag in my pack and it's ready to go. Super soft and love the hood on cooler nights when the bag would be too warm. I'm 5'-4" and purchased the 'compact' to shave off a few more ounces. I do wish I had gotten the 'regular' length instead as I burrow down when nights are cold and find my feet fighting for space. This works great as a lightweight sleeping bag when it's a bit warmer overnight and I can use my Disco as more of a quilt. Highly recommend!