Kelty Cosmic Synthetic Fill 20 Degree Sleeping Bag, Long – Cirroloft Insulation & Compression Straps

Overview

The Kelty Cosmic Synthetic Fill 20 Degree Sleeping Bag for Long users delivers three-season warmth in a compact, budget-friendly package. Built with Cirroloft synthetic insulation, it maintains loft and warmth even when conditions are damp, so you can focus on the trail instead of worrying about the weather. The bag combines lightweight design with real-world features that backpackers appreciate, from easy packing to thoughtful storage details.

Why this bag stands out

• Light on weight, heavy on warmth: total weight around 2 lbs 13 oz with a fill that blankets without bulk.
• Compact packing: includes an integrated compression stuff sack to help you minimize your pack’s footprint.
• Ready for moist nights: Cirroloft insulation maintains loft for even coverage with fewer cold spots.
• Tailored comfort: long length accommodates sleepers up to 6'6" with a roomy fit and a surprisingly breathable fabric.

Insulation and warmth

Cirroloft synthetic insulation provides reliable warmth in cool and damp conditions. The design aims for even loft across the body, helping you stay comfortable as outdoor temperatures dip. While temperature needs vary by person, the bag is positioned as a versatile three-season option for a wide range of nights outdoors.

Fit, size and storage

• Long size: sleepers up to 6'6"; Regular size fits up to 6'.
• Non-compressed size roughly 16 x 9 inches, aiding quick setup and compact packing.
• External stash pocket provides convenient space for small overnight essentials.

Packability and durability

Designed for trail-ready durability, the Cosmic Synthetic is easy to compress and store. The integrated compression sack and the soft nylon taffeta fabric balance packability with a comfortable feel against the skin, making it a practical option for hikers who value both ease of transport and a pleasant sleeping surface.

What you get on the trail

• Three-season warmth in a lightweight mummy profile, suitable for varied alpine and forest environments.
• Soft, silk-like interior feel and a colorway that blends into campsite aesthetics: Tapestry Blue/Smoke.
• A trusted Kelty build and craftsmanship, designed to endure the rigors of camping, car-to-campsite transitions, and beyond.

Suggested use scenarios

• Long-distance backpacking where pack weight matters but warmth is needed on damp nights.
• Backcountry trips with unpredictable weather, where compact storage and quick setup are beneficial.
• Spare bed in a mountain hut or tent, offering a reliable warmth layer without bulk.