TrailForge Modular Sleep System 45

The Modular Sleep System 45 earns its edge by pairing a 45‑Fahrenheit down‑filled quilt with a detachable fleece liner that snaps on for chilly mornings above 7,000 ft. The quilt’s 900 fill‑power down is encased in a 20‑denier ripstop shell, providing a 1.5:1 warmth‑to‑weight ratio. The integrated compression sack folds the quilt down to 5" × 7" × 2", fitting snugly into the 15‑liter side pocket of the Ultralight Trek Pack. The fleece liner, cut from 100 gsm Polartec, slides into zippered channels on the quilt’s interior, adding up to 12 °F of extra warmth without bulk. Reflective stitching aids visibility at night, and the quilt’s horn‑loop corners attach to tree branches for a hammock‑style suspension. Whether you’re shivering in a snow‑kissed canyon or cooling off after a day‑long trek, the Modular Sleep System adapts without extra gear.