Clothing and Sleep Systems for Mountain Hiking, 1st Edition (August 2002)
Nunatak Arc Alpinist
The Polarguard 3D-filled GoLite Flash Sleeping Bag takes a modular approach to sleep systems, with a removable top that can be used to adjust the temperature range of the bag: when it's warm, simply zip it off and leave it home.
Functional Designs Sweetie Pie Summer Bag Doubler
Book Review: Beyond Backpacking