Mountain Hardwear Phantom Spark

The Mountain Hardwear Phantom Spark is a 3-season mummy bag built around Q.Shield 800-fill, hydrophobic-treated, RDS-certified goose down (285 g fill), packed into a 10D Bright Filament Cire shell using horizontal box-baffle construction — a construction choice aimed at even loft distribution rather than the vertical baffles some ultralight bags use to save weight. EN 13537 testing gives a 2°C comfort rating, -2°C limit, and -19°C extreme, with a total weight of 648 g. Packed size is a compact 25 x 15 cm, among the smaller volumes in its weight class, useful when pack space is tighter than weight is critical. The single right-side, full-length two-way zipper (rather than the dual-zipper setup on Mountain Hardwear's roped Alpine bags) keeps things simple for solo backpacking use, paired with an adjustable, fitted hood, draft collar, draft tube, and an internal pocket for a phone or headlamp. Internal dimensions (183 cm length, 150 cm shoulder, 135 cm hip, 97 cm foot) fit a regular-sized user comfortably without excess room to heat. This is a straightforward 3-season backpacking bag rather than a specialist alpine design — a solid choice for weekend trips and multi-day trekking where compressibility matters as much as raw weight.