The Kelty Cosmic 35 Degree Sleeping Bag. The lightweight Cosmic 35° with a 3/4-length zipper is the mummy bag of choice for summer backpacking adventures. Value-minded adventurers in all climates will appreciate how comfortable and stylish this synthetic bag is.
DECENT FEATURES of the Kelty Cosmic 35 Degree Sleeping Bag
Quilt-shell, loose-liner construction
58" two-way locking zipper
Zipper draft tube with anti-snag design
Internal liner loops
Sleeping pad security loops
Captured cordlock
Hang loops for storage
Ground-level side seams and differential cut for maximum warmth
I've only used this bag camping but can't wait for summertime to take backpacking very soon. The bag was comfortable right away with a fitted feal (not too tight, not excess room) and packs small and light. I'm 6'3" and the long fits great. I would have perfered more than the 3/4 length zipper if I sleep hot, but it is more mummy style than rectangular for use as a blanket anway.
This bag will be great in the fall and spring. I have taken it out 4 times now, and its great. Not a summer bag though, does not vent well. but if you are sleeping in 40 - 65 degrees you would be smart to go with this bag. Lightweight and compressible.