It’s worth mentioning that there is a tiny subgroup of sleeping bag/quilt hybrids that retains many characteristics of both. For example, the hybrid Feathered Friends Flicker UL features a full-length zipper that extends all the way through the footbox. On cold nights, the Flicker encloses your body completely, à la sleeping bag (a cinch tightens the footbox to minimize cold air spots), and on warm nights it opens all the way up into a blanket. Another hybrid option is the Therm-a-Rest Ohm, which features a more roomy, semi-rectangular shape that opens up into a quilt for two. These hybrid options are super versatile ultralight sleep systems that cross over from cold to warm better than most, but keep in mind that the full-length zipper does add some weight. For example, the 30-degree Flicker is 1 pound 6 ounces compared to the 1-pound-5.4-ounce Hummingbird sleeping bag and 1-pound-3.8-ounce Katabatic Gear Palisade quilt (both also 30°F). For a more detailed breakdown of the categories mentioned above, see our article on . Another unique hybrid option is the popular Zenbivy Ultralight Bed, which pairs a quilt and sheet together in one streamlined package., See our guide to the best ultralight sleeping bags and quilts of 2025, with reviews of sleep systems from Feathered Friends, Enlightened Equipment, REI Co-op, and more., Over the last eleven years, we have bought and tested over 50 ultralight sleeping bags. Our expert gear team, comprised of rock climbers, thru-hikers, and fast packers, puts each sleeping bag through controlled temperature testing before spending countless nights under the stars and across the globe..