Aegismax Ultralight 95% Goose Down Mummy

The Aegismax G1 packs 800 fill power goose down at a 95/5 down-to-feather ratio into a full mummy shape, arriving at a comfort rating of +3°C, a -2°C limit, and a -18°C extreme figure — useful context for reading these numbers is that the extreme rating describes survival, not comfortable sleep. Weight is 722g including stuff sack, competitive for a mummy bag with a full-length left-side zipper, differential cut, and a horizontal box-baffle build rather than the sewn-through construction found on cheaper bags. The 15D nylon DWR shell keeps the packed size down to about 35x15cm. Two bags of this model can be zipped together (coupleable), useful for couples, though the down here is not hydrophobic-treated and not RDS-certified, so care in wet conditions matters more than with treated-down products. Made in China. It suits 3-season backpacking and thru-hiking down toward freezing, where low weight matters but where a full hood, draft collar, and zippered closure are preferred over a quilt's open design.