HighLite

The HighLite strips down the traditional mummy bag to its bare functional minimum without ditching the security of a full hood. Weighing around 16 ounces, it targets gram-counting thru-hikers and fastpackers who prefer an enclosed, draft-free sleep system over an open quilt. The silhouette is decidedly trim, measuring a narrow 59 inches at the shoulder, meaning broad-shouldered sleepers or active side-sleepers will feel every inch of the taper.

Western Mountaineering builds this bag in California using premium 850-plus fill power goose down encased in their featherweight ExtremeLite shell fabric. Construction combines box baffles with sewn-through vertical seams to prevent down migration while keeping weight down. In the field, the 35-degree rating holds up conservatively compared to mass-market ISO ratings, provided you pair it with a properly insulated sleeping pad. The half-length zipper shaves ounces, though it restricts venting on mild summer evenings and makes getting in and out slightly clumsy.

Compressed, the bag takes up virtually no pack volume, easily disappearing into a frameless pack alongside a weekend's worth of gear. The sheer shell fabric demands caution around sharp shelter zippers and abrasive surfaces, but the build quality and stitch density are benchmark-grade. For three-season wilderness travel where every ounce counts and overnight lows hover above freezing, few fully enclosed bags can match its thermal efficiency per ounce.