Feathered Friends Hummingbird UL 30 Review – The Ultralight Backpacker’s Dream

Feathered Friends Hummingbird UL 30 review: An ultralight sleeping bag offering exceptional warmth, durability, and packability for serious backpackers.
Feathered Friends Hummingbird UL 30

Feathered Friends Hummingbird UL 30

Experience Unmatched Warmth and Weight Savings with the Feathered Friends Hummingbird UL 30
The Feathered Friends Hummingbird UL 30 is a top-tier ultralight sleeping bag offering exceptional warmth, comfort, and packability for dedicated outdoor enthusiasts.


Warmth & Insulation
Packability & Weight
Comfort & Fit
Durability & Materials
Versatility & Features


  • Exceptional warmth-to-weight ratio
  • High-quality materials
  • Compact and packable
  • Comfortable and roomy design
  • Thoughtful features


  • High cost
  • Limited temperature range
  • Delicate materials
  • Minimalist features


Brief Overview

The Feathered Friends Hummingbird UL 30 is a premium sleeping bag designed for the avid outdoors enthusiast seeking a lightweight, high-performance sleeping solution. This sleeping bag is part of Feathered Friends’ ultralight series, meticulously engineered to provide maximum warmth with minimal weight, making it an excellent choice for backpackers, hikers, and climbers who demand the best in their gear. The Hummingbird UL 30 stands out for its exceptional warmth-to-weight ratio, compressibility, and high-quality materials, promising a comfortable night’s sleep even in challenging conditions.

Initial Impressions and Context of Testing

Upon unboxing the Feathered Friends Hummingbird UL 30, the first thing that struck me was its impressively compact size and feather-light weight. Weighing just over a pound, it is incredibly easy to pack and carry, making it ideal for multi-day treks where every ounce counts. The sleek design and meticulous craftsmanship were immediately apparent, with smooth, high-quality zippers and a well-finished exterior.

To put the Hummingbird UL 30 to the test, I took it on a three-night backpacking trip in the Rocky Mountains. Temperatures during the trip ranged from 35°F to 45°F, providing an excellent environment to evaluate the bag’s performance under realistic conditions. The sleeping bag was used in conjunction with a lightweight tent and a standard sleeping pad, ensuring a fair assessment of its capabilities. The Hummingbird UL 30’s performance during this trip offered valuable insights into its real-world functionality, which I will detail further in this review.

Technical Specifications

Key Features and Technology

The Feathered Friends Hummingbird UL 30 boasts a range of impressive features and cutting-edge technologies that make it a standout in the ultralight sleeping bag market:

  • Ultra-Premium 950+ Fill Power Down: The bag is filled with ethically sourced, RDS-certified 950+ fill power goose down, renowned for its superior loft, warmth, and compressibility.
  • Lightweight Design: Weighing just 21 ounces (595 grams), this sleeping bag is one of the lightest in its category, ideal for ultralight backpacking and long-distance hiking.
  • Temperature Rating: Rated for temperatures as low as 30°F (-1°C), it provides reliable warmth in three-season conditions.
  • No-Snag Zipper Design: The YKK #5 zipper runs smoothly and is designed to prevent snags, ensuring easy entry and exit.
  • Continuous Baffle Construction: This design allows for the even distribution of down, preventing cold spots and ensuring consistent insulation.

Design and Materials

The Feathered Friends Hummingbird UL 30 is crafted with meticulous attention to detail, using top-tier materials that balance durability and weight savings:

  • Pertex® Quantum Shell: The outer shell is made from Pertex® Quantum fabric, which is both lightweight and highly durable, providing excellent abrasion resistance and protection against the elements.
  • DWR Treatment: The shell is treated with a durable water repellent (DWR) finish to resist moisture and maintain the loft and performance of the down insulation.
  • Interior Lining: The inside of the bag features a soft, comfortable lining that enhances the overall sleeping experience.

Additional Features

  • Adjustable Hood: The adjustable hood can be cinched down to trap heat and keep your head warm during chilly nights.
  • Draft Collar and Draft Tube: These features prevent cold air from entering the bag, ensuring you stay warm throughout the night.
  • Stuff Sack and Storage Bag: The Hummingbird UL 30 comes with a stuff sack for compact packing and a larger storage bag for maintaining loft when not in use.

With these advanced specifications, the Feathered Friends Hummingbird UL 30 positions itself as an elite option for outdoor enthusiasts who refuse to compromise on performance, comfort, or weight. Whether you’re embarking on a high-altitude trek or a multi-day backcountry adventure, this sleeping bag is designed to meet the demands of serious adventurers.

Performance Evaluation

Fabric Performance

Breathability: The Feathered Friends Hummingbird UL 30 excels in breathability, thanks to its Pertex® Quantum shell fabric. This material effectively wicks away moisture, ensuring that condensation does not build up inside the bag, which is crucial for maintaining comfort during varying nighttime temperatures. During my trip, even after a strenuous day of hiking, the sleeping bag remained dry and comfortable, effectively managing body moisture.

Waterproofing: While the Hummingbird UL 30 is not fully waterproof, its DWR (Durable Water Repellent) treatment provides excellent resistance to light moisture and dew. This feature is particularly beneficial in damp conditions, such as morning condensation inside a tent. On one dewy morning in the Rockies, I noticed that the shell repelled moisture effectively, preventing the down fill from becoming compromised.

Durability: The combination of the Pertex® Quantum shell and high-quality stitching contributes to the bag’s overall durability. Despite being incredibly lightweight, the fabric withstood the rigors of the trip without any signs of wear or tear. Even when packed tightly in my backpack, the bag maintained its integrity and performance.

Weather Resistance

Cold Conditions: The Hummingbird UL 30 is rated for temperatures as low as 30°F (-1°C), and it performed admirably within this range. During nights when temperatures dropped to the mid-30s, I remained comfortably warm without the need for additional layers. The continuous baffle construction ensured an even distribution of down, preventing cold spots.

Wind Resistance: The bag’s shell fabric also provides a significant barrier against wind. When pitched in an exposed campsite with gusty winds, the Hummingbird UL 30’s design minimized heat loss and blocked out drafts effectively, ensuring a warm and cozy sleep environment.

Practical Features

Hood Adjustments: The adjustable hood on the Hummingbird UL 30 is a standout feature, allowing for a snug fit that traps heat around the head and neck. This feature was particularly useful during colder nights, enhancing overall warmth.

Draft Collar and Draft Tube: Both the draft collar and draft tube are essential for sealing out cold air. The draft collar fits comfortably around the neck, while the draft tube along the zipper prevents heat from escaping through the zipper, which was evident during the coldest nights of my trip.

Zipper Functionality: The YKK #5 zipper is robust and operates smoothly without snagging, even when making adjustments in the middle of the night. The zipper’s ease of use is a critical aspect, especially when needing to quickly exit or enter the bag.

Compressibility: One of the most practical features of the Hummingbird UL 30 is its compressibility. It packs down exceptionally small into the provided stuff sack, saving valuable space in my backpack. This compressibility did not compromise the bag’s loft, as it quickly regained its full shape and insulation properties when unpacked.

The Feathered Friends Hummingbird UL 30’s performance in real-world conditions affirms its status as a top-tier ultralight sleeping bag. Its blend of breathability, water resistance, durability, and practical features ensures it stands up to the demands of serious backpackers and outdoor enthusiasts.

Fit and Comfort

Sizing and Fit

The Feathered Friends Hummingbird UL 30 is designed with a thoughtful balance between weight savings and user comfort. It comes in multiple sizes, ensuring a good fit for a wide range of body types. I tested the regular size, which is suitable for individuals up to 6 feet tall. For taller users, the long version accommodates heights up to 6’6″. The bag’s dimensions are well-considered, providing ample room in the shoulders and hips without excess material that could add unnecessary weight.

Regular Size:

  • Fits up to 6 feet tall
  • Shoulder girth: 60 inches
  • Hip girth: 54 inches

Long Size:

  • Fits up to 6’6″ tall
  • Shoulder girth: 62 inches
  • Hip girth: 56 inches

Comfort During Various Activities

Sleeping Comfort: The interior lining of the Hummingbird UL 30 is soft and pleasant against the skin, enhancing overall sleeping comfort. The down insulation provides a cozy and warm sleeping environment, while the adjustable hood and draft collar add to the snug, cocoon-like feel. Throughout my trip, I experienced consistently comfortable and uninterrupted sleep, even in fluctuating temperatures.

Versatility in Sleeping Positions: As a side sleeper, I often find some sleeping bags restrictive. However, the Hummingbird UL 30 offered enough room to change positions comfortably. The generous shoulder and hip girth allowed me to move without feeling confined, making it suitable for side, back, and stomach sleepers alike.

Ventilation Options: For warmer nights, the two-way zipper provides excellent ventilation options. I could easily unzip the bag from the bottom to allow airflow to my feet, preventing overheating. This feature is particularly useful for adapting to varying night temperatures, ensuring a comfortable sleep regardless of the weather.

Weight Distribution: The lightweight design does not compromise on insulation distribution. The continuous baffle construction ensures the down fill remains evenly distributed, preventing cold spots and maintaining consistent warmth throughout the night. This even weight distribution also contributes to the bag’s overall comfort, as it wraps around the body smoothly without lumps or thin spots.

Packability and Portability: Comfort extends beyond sleep quality; it also includes the ease of transporting the bag. The Hummingbird UL 30 packs down impressively small and light, making it a breeze to carry on extended trips. Its compact size and minimal weight added to my overall comfort by reducing the load in my backpack, allowing for more enjoyable hiking during the day.

The Feathered Friends Hummingbird UL 30’s design prioritizes user comfort without sacrificing the lightweight and packable qualities essential for backpacking. Its thoughtful sizing, soft materials, and practical features combine to provide a comfortable and restful sleeping experience in various outdoor conditions.

Pros and Cons


Exceptional Warmth-to-Weight Ratio:

  • The Feathered Friends Hummingbird UL 30 offers outstanding warmth for its minimal weight. The 950+ fill power goose down provides excellent insulation, keeping you warm in temperatures as low as 30°F (-1°C) while weighing just 21 ounces.

High-Quality Materials:

  • The use of Pertex® Quantum shell fabric and a durable water repellent (DWR) finish ensures the sleeping bag is both lightweight and resistant to moisture. The premium materials contribute to the bag’s durability and performance.

Compact and Packable:

  • This sleeping bag compresses down to a very small size, making it easy to pack and carry. It’s an excellent choice for backpackers who need to save space and reduce weight in their packs.

Comfortable and Roomy Design:

  • The Hummingbird UL 30 features a spacious shoulder and hip girth, making it comfortable for various sleeping positions. The soft interior lining and adjustable hood enhance overall sleeping comfort.

Thoughtful Features:

  • Practical features such as the no-snag YKK zipper, draft collar, and draft tube enhance the bag’s functionality and user experience. These elements ensure warmth and ease of use in various conditions.


High Cost:

  • The premium materials and construction come at a high price. The Hummingbird UL 30 is a significant investment, which may not be feasible for all budgets.

Limited Temperature Range:

  • While the bag is excellent for three-season use, it may not be sufficient for winter conditions or temperatures below 30°F. Users who frequently camp in colder environments might need a more robust option.

Delicate Materials:

  • The lightweight fabric, while durable, requires careful handling to avoid punctures or tears. This can be a consideration for users who are rough on their gear or often camp in rugged environments.

Minimalist Features:

  • To keep the weight down, the Hummingbird UL 30 lacks some features found in heavier sleeping bags, such as internal pockets or extensive ventilation options. Users seeking more bells and whistles might find this bag too minimalist.

The Feathered Friends Hummingbird UL 30 shines in many areas, particularly in its warmth, weight, and packability. However, its high cost and delicate materials might be drawbacks for some users. Weighing these pros and cons can help potential buyers determine if this sleeping bag meets their specific needs and preferences.

Comparative Analysis

When comparing the Feathered Friends Hummingbird UL 30 to the Kelty Cosmic Down 20 and the REI Magma 15, several key differences and similarities emerge, highlighting each sleeping bag’s strengths and potential drawbacks.

The Feathered Friends Hummingbird UL 30 is designed for ultralight backpacking, boasting a 950+ fill power goose down and weighing just 21 ounces. This makes it an ideal choice for those who prioritize minimal weight and maximum compressibility without sacrificing warmth. However, it comes with a higher price tag and requires careful handling due to its delicate materials.

In contrast, the Kelty Cosmic Down 20 offers a more budget-friendly option, utilizing 600-fill hydrophobic down. While it is heavier and bulkier than the Hummingbird UL 30, it still provides reliable warmth down to 20°F. This sleeping bag is an excellent choice for those who want a balance between cost and performance, though it may not compress as well as the Feathered Friends model.

The REI Magma 15 strikes a balance between the two, offering a high fill power of 850 and a weight of around 24 ounces. This bag is slightly heavier than the Hummingbird UL 30 but offers superior warmth with a lower temperature rating of 15°F. It also features a more robust design, making it a versatile choice for various conditions and seasons, while still being relatively lightweight and packable.

In summary, the Feathered Friends Hummingbird UL 30 excels in ultralight performance and warmth, ideal for weight-conscious backpackers. The Kelty Cosmic Down 20 provides a cost-effective and reliable option for general use, while the REI Magma 15 offers a middle ground with excellent warmth-to-weight ratio and versatile features, making it suitable for a broader range of adventures.


The Feathered Friends Hummingbird UL 30 stands out as a premier choice for ultralight backpackers seeking exceptional warmth, compressibility, and performance. Its 950+ fill power goose down ensures remarkable insulation for three-season use, while the Pertex® Quantum shell and DWR treatment offer excellent moisture resistance and durability. Despite its premium price, the investment is justified by the quality of materials and construction, making it a reliable companion for serious outdoor enthusiasts.

However, those on a tighter budget or needing a more rugged sleeping bag for extreme conditions might consider alternatives like the Kelty Cosmic Down 20 or REI Magma 15. Ultimately, the Hummingbird UL 30 is best suited for hikers, climbers, and backpackers who prioritize ultralight gear and are willing to invest in top-tier performance for their adventures. Its blend of lightweight design and superior warmth makes it a standout in the market.

Further reading