Sleeping Bags
Recommended Brands:
Feathered Friends
Marmot
Moonstone
Northface
Also:
Look for tight, even, short stitches so you don't loose fill.
The narrower and more numerous the baffles the better distributed the insulation
0 degree bags are best for 3 season use, but may be too warm in the summer. Look for 2-way zippers so you can vent the bag when its warm.
For extra warmth, use a bivy sack or inner liner of silk, cotton, or cotton\polyester blend
Air out your sleeping bag in the morning to let the perspiration dry before its re-packed
(Backpacking Primer, Lori Saldanas
)
(Advanced Backpacking -A Trail Side Guide, by Berger
)
Synthetic insulation with “continuous filament” works best
Wear warm, dry (sweat-free) cloethes to bed and a hat for extra warmth
(Hiking and Backpacking by Eric Seaborg and Ellen Dudley
)