The Exped Ultra 0°C/30°F down mummy sleeping bag blends ultralight design and premium materials to create a sleeping bag that is fully recyclable when it’s time to retire it. Available in multiple sizes, including those for backpackers of larger stature, it’s comfortable and well-designed, but comes with the trade-offs you’d expect in the ultralight category

• Type: Mummy sleeping bag
• Comfort rating: 43°F
• Lower limit rating: 34°F
• Extreme rating: 7 °F
• Gender: Unisex
• Sizes available: Small, Medium, Medium Wide, Large, Large Wide
• Insulation 850+ fill power white Muscovy Duck Down, RDS certified
• Size tested: Medium Wide (1 lb 8.5 oz)
• Weight of down fill: 12 oz
• Zipper Length: 3/4, bidirectional
• Draft collar, side draft tube: Yes
• Pockets: one, interior

Design and Features

Fabrics

The Exped Ultra 0°C/30°F is a mummy-style sleeping bag made with an ultralight 10D ripstop nylon shell and a silky 15D ripstop nylon liner. While these lighter-weight fabrics will hold up well with careful use, avoid zipper snags to prevent tearing. If the zipper gets stuck, gently pull the fabric, and it should come free.

A full-length down-filled draft tube runs adjacent to the zipper, preventing drafts from entering the sleeping bag and chilling you. The draft tube is protected from zipper snags by extra stitching, but care must still be exercised when opening or closing the zipper. The top of the zipper is secured with a snap to offload pressure on the zipper and to allow venting at the top of the bag.

A full-length draft tube runs along the zipper to prevent side drafts

Zipper

Exped uses a high-quality, snag-free YKK zipper with dual sliders on this bag, so you can vent the lower portion if you get too warm. The top zipper pull is accessible from both the outside and the inside of the bag, which is handy on a mummy bag since your hands will be trapped inside when it’s shut. The zipper also has a glow-in-the-dark pull for night use. The left-zip configuration is standard but worth noting. A large zipper garage at the hood effectively keeps hardware away from your face, and large zipper pulls operate easily with gloves.

The hood is controlled by a cord lock opposite the zipper

Mummy hood and draft collar

The Exped Ultra 0°C/30°F has a low-profile mummy hood with a beefy draft collar that prevents cold air from entering the sleeping bag through the hood and helps insulate your face, neck, and upper shoulders. The fit of the hood opening is controlled by a cord lock positioned on the right of the hood with two cords emanating from it. The top cord controls the size of the face opening, while the bottom cord controls the tightness of the hood’s draft collar. It’s not obvious how to use it without experimentation.

Temperature Performance and ISO Testing

Understanding the temperature ratings is crucial with this bag. The ISO testing reveals important nuances:

• Comfort rating: 43°F – where an average woman will sleep comfortably
• Lower limit: 34°F – where an average man will sleep without waking from the cold
• Manufacturer rating: 30°F – optimistic for most users

This sleeping pad is named the Exped Ultra  0°C/30°F, which is misleading because the bag’s ISO lower limit rating, the lowest temperature that an average man will sleep without waking from cold, is higher.  I don’t consider that transparent marketing. A transparent product name would be the Exped Ultra 1°C/34°F, or even better, the Exped Ultra 4°C/40°F, since this is a unisex bag and half the men using it will still be cold at 34°F. Someone had to point this out.

This aligns with my experience as a cold sleeper: I found the sleeping bag’s temperature rating low, and I consider it more of a summer bag, good for temperatures of 40 degrees or higher. Personally, I prefer using a quilt or a hoodless sleeping bag in such conditions and would recommend that you take a look at the Exped Ultra Quilt 0°C/30°F instead if using a sustainable option is a priority for you.

Size and Fit Analysis

The Medium Wide model tested offers excellent sizing for broader-shouldered sleepers, with a length of 72 inches and a shoulder girth of 64 inches. The additional 6 inches of shoulder room compared to the regular Medium (58 inches) makes a substantial comfort difference without excessive weight penalty (only 2 oz. more).

The 3D footbox provides genuine room for natural foot positioning, something often compromised in ultralight designs. This translates into noticeably better sleep quality than more restrictive mummy bags, especially in the Wide version, which allows side sleeping without feeling constricted.