Kelty Cosmic 40°F regular on-trail warmth and comfort for three-season trips.
Kelty Cosmic Synthetic CirroLoft insulation provides reliable warmth in damp conditions.
Kelty Cosmic sleeping bag uses soft nylon taffeta fabric for a comfortable, silky feel.
Kelty Cosmic includes an integrated compression stuff sack for compact packing.
Kelty Cosmic's roomy footbox lets you wiggle your toes during sleep.
Kelty Cosmic exterior stash pocket for quick-access essentials in the tent.
Kelty Cosmic Regular size fits sleepers up to 6'6" for natural comfort.
Kelty Cosmic weighs 2 lb 6 oz in regular size for lightweight backpacking.
Kelty Cosmic packs down to 15x8 inches for easy carry and storage.
Kelty Cosmic in Duffel Bag Green/Smoke color for rugged outdoor styling.
Kelty Cosmic 40°F regular on-trail warmth and comfort for three-season trips.
Kelty Cosmic Synthetic CirroLoft insulation provides reliable warmth in damp conditions.
Kelty Cosmic sleeping bag uses soft nylon taffeta fabric for a comfortable, silky feel.
Kelty Cosmic includes an integrated compression stuff sack for compact packing.
Kelty Cosmic's roomy footbox lets you wiggle your toes during sleep.
Kelty Cosmic exterior stash pocket for quick-access essentials in the tent.
Kelty Cosmic Regular size fits sleepers up to 6'6" for natural comfort.
Kelty Cosmic weighs 2 lb 6 oz in regular size for lightweight backpacking.
Kelty Cosmic packs down to 15x8 inches for easy carry and storage.
Kelty Cosmic in Duffel Bag Green/Smoke color for rugged outdoor styling.

Kelty Cosmic Synthetic Fill 40°F Backpacking Sleeping Bag – Regular (2025)

OverviewThe Kelty Cosmic Synthetic Fill 40 Degree Sleeping Bag is a thoughtfully designed three‑season option built for backpackers who value...
Vendor: Kelty
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Kelty Cosmic 40°F regular on-trail warmth and comfort for three-season trips.

Kelty Cosmic Synthetic Fill 40°F Backpacking Sleeping Bag – Regular (2025)

$199.89
Kelty Cosmic 40°F regular on-trail warmth and comfort for three-season trips.
Kelty Cosmic Synthetic CirroLoft insulation provides reliable warmth in damp conditions.
Kelty Cosmic sleeping bag uses soft nylon taffeta fabric for a comfortable, silky feel.
Kelty Cosmic includes an integrated compression stuff sack for compact packing.
Kelty Cosmic's roomy footbox lets you wiggle your toes during sleep.
Kelty Cosmic exterior stash pocket for quick-access essentials in the tent.
Kelty Cosmic Regular size fits sleepers up to 6'6" for natural comfort.
Kelty Cosmic weighs 2 lb 6 oz in regular size for lightweight backpacking.
Kelty Cosmic packs down to 15x8 inches for easy carry and storage.
Kelty Cosmic in Duffel Bag Green/Smoke color for rugged outdoor styling.

Kelty Cosmic Synthetic Fill 40°F Backpacking Sleeping Bag – Regular (2025)

$199.89
Description
Description
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Overview

The Kelty Cosmic Synthetic Fill 40 Degree Sleeping Bag is a thoughtfully designed three‑season option built for backpackers who value warmth, compactness, and value. Lightweight yet capable, it uses CirroLoft synthetic insulation to maintain loft and provide even coverage without heavy bulk. The soft nylon taffeta lining adds a silky feel against the skin, helping you focus on the trail rather than fabric texture.

Key features at a glance

  • 40°F (≈4°C) temperature rating with a Regular fit that accommodates sleepers up to 6 ft 6 in
  • Fill weight of 24 oz and total weight of 2 lb 6 oz for a lightweight option
  • Non‑compressed pack size of 15 x 8 inches and an integrated compression stuff sack for efficient packing
  • CirroLoft synthetic insulation delivers reliable warmth and loft even in damp conditions
  • Natural, roomy footbox and exterior stash pocket for small overnight essentials
  • Colorway Duffel Bag Green/Smoke with Kelty craftsmanship designed for rugged outdoor use

Packability and size advantages

  • Integrated compression sack helps achieve minimalist pack standards, aiding lineup with other ultralight gear
  • Regular length provides comfortable toe space and easy fit for a wide range of hikers
  • Stuffed form is compact enough to slide into a backpack without crowding other gear

Comfort, materials, and durability

The nylon taft fabric feels smooth against the skin, reducing surface friction as you move. CirroLoft insulation keeps loft high for even warmth, while the durable shell and seam construction are designed to withstand routine outdoor use from the trail to the campground. The exterior stash pocket adds quick access to small items you want on hand in a tent or shelter.

Use cases and benefits

  • Three‑season performance makes it versatile for a variety of campsites and night temps
  • Lightweight construction supports longer treks and multi‑night trips
  • Compact packing helps maintain a well‑organized pack for fast takeoffs after sunset

FAQ

Q: What makes the CirroLoft insulation beneficial in this sleeping bag?

A: CirroLoft offers lightweight, compressible warmth with durable loft for even coverage.

Q: How compact and lightweight is the Cosmic Synthetic for backpacking?

A: Total weight is about 2 lb 6 oz, packing down to roughly 15x8 inches with an integrated compression sack.

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Additional Information
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Shipping & Return
Shipping & Return
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You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.

Shipping

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When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

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