Sea to Summit Traveller Down Sleeping Bag

The Sea to Summit Traveller is a lightweight down sleeping bag at 546 g, using 650+ fill power duck down treated with a non-PFAS Ultra-Dry Down finish to resist moisture — useful given down's usual weak spot is losing loft when damp. The semi-rectangular shape trades some of a mummy bag's thermal efficiency for more room to move, and the full-length zipper lets the bag open flat as a quilt or zip together with a second compatible bag for double use. At 20-denier, the shell is light rather than rugged, so this is a bag for careful packing and use rather than rough handling against rock or thorns. RDS-certified down and recycled shell materials point to a more responsibly sourced build. It carries a 7°C ISO lower limit and an 11°C women's comfort rating, so match season and location to that warm-weather range rather than your own judgement. This suits travellers and hut-based trips wanting a light, packable bag with the flexibility of a quilt, more than serious cold-weather mountaineering.