Kelty Cosmic Synthetic Fill 0°F Sleeping Bag – Long (6 ft 6 in) with Compression Straps & Stuff Sack | CirroLoft ECO

Overview

The Kelty Cosmic Synthetic Fill 0°F Sleeping Bag blends warmth and value for winter and shoulder-season adventures. Built with CirroLoft ECO insulation sourced from recycled fibers, this mummy-style bag stays lightweight and highly compressible, helping you carry less while keeping a comfortable core temperature on cool nights. The durable nylon shell features a PFAS-free DWR finish for weather defense, and a silky taffeta liner cushions the night’s rest after a long day on the trail.

Designed to maximize heat retention without bulk, the bag uses a contoured hood, a full draft collar, and offset quilt construction to minimize cold spots. Together, these features support a calmer sleep environment in camp, while preserving mobility for late-night stargazing or early-morning starts.

Warmth, Loft, and Comfort

CirroLoft ECO insulation delivers dependable loft and warmth in damp, chilly conditions, while the inner lining feels smooth against the skin. The combination aims to keep warmth evenly distributed across key areas without adding unnecessary weight.

• 0°F rating for cool-to-cold nights
• Loft retention helps maintain even coverage
• Soft inner lining enhances comfort after adventures

Materials, Sustainability, and Weather Defense

The outer shell uses PFAS-free DWR to shed moisture and wind, paired with CirroLoft ECO insulation from recycled fibers. This setup offers a responsible approach to warmth that’s intended for rugged outdoor use and variable weather.

• Nylon shell with PFAS-free DWR finish
• CirroLoft ECO insulation from recycled fibers
• Silky taffeta liner for a comfortable sleep surface

Packability, Fit, and Practical Details

In the Long size, this sleeping bag accommodates sleepers up to six feet six inches. It includes an integrated compression stuff sack that helps it reach a minimalist pack size, while the total weight sits around 4 lb 11 oz and non-compressed dimensions are 17x11 inches.

• Long size for taller sleepers
• Integrated compression sack for compact packing
• Total weight around 4 lb 11 oz

Durability, Use Case, and Craftsmanship

Kelty gear is built for trail-tested use, from backcountry campsites to long days on rugged terrain. The bag’s weather defenses, contoured fit, and reliable construction make it a versatile option for hikers who want warmth without excessive bulk. Exterior details include a stash pocket for small overnight essentials and a design that’s prepared for varied environments.

With thoughtful design and durable materials, the Cosmic Synthetic Fill bag is prepared for a range of adventures—whether you’re chasing alpine sunrises, sleeping in a tent after a cold day, or layering up for a windy overnight, this bag is meant to be a dependable companion on the road, in the tent, and beyond.