The Swallow UL 30 is Feathered Friends' ultralight take on a three-season mummy bag, built around 385 g of 950 fill-power RDS-certified goose down for a total weight of just 633 g in Regular size. That is a low figure for a bag rated to -1°C, made possible by continuous horizontal baffles that let the down loft evenly without cold spots, and a 7D/30D Pertex Quantum Pro shell that trims fabric weight without giving up tear strength.
Inside, a Flyte 10D recycled nylon liner and a reinforced Pertex Diamond Fuse footbox add durability exactly where a sleeping bag wears fastest, while the full-length two-way zipper, draft collar and draft tube keep warm air from leaking out. The adjustable fitted hood cinches for cold nights or opens for ventilation on milder ones. Packed volume is 8 L, small enough for a frameless or minimalist pack.
Built for weight-conscious three-season backpacking, the Swallow UL 30 needs a liner or added layer past its -1°C limit. Handmade in Seattle and bluesign certified, it rewards hikers chasing low base weight over four-season margin.