10 Best Ultralight Sleeping Bags 2025 in the United States

The QEZER Down Sleeping Bag is an ultralight mummy-style sleeping bag designed for adults. It stands out due to its impressive warmth retention, thanks to the 620 Fill Power down filling and additional cotton insulation at the chest area. This ensures comfort in temperatures ranging from 18°F to 32°F, with a limit down to 10°F, making it suitable for cold weather camping.

Weighing just 3.73 lbs and packing down to a compact size of 14.6 x 7.9 inches, it is easily portable and ideal for backpacking and hiking trips. The mummy shape offers a snug fit but also includes a trapezoidal bottom for extra foot space, enhancing comfort during sleep. Constructed from 400T 40D tear-resistant nylon fabric, it is both durable and resistant to water and wind, which is beneficial in harsh outdoor conditions.

Additional features include an inner pocket for small items and the option to zip two sleeping bags together for couples. However, some users might find the tight mummy fit restrictive, and the need to ventilate the sleeping bag for several hours after unpacking could be a minor inconvenience.

The Big Agnes Torchlight EXP is a well-designed ultralight sleeping bag aimed at backpackers needing warmth and versatility in cold weather. It weighs just under 4 pounds, which is quite light for a 0-degree rated bag, making it suitable for serious cold weather camping without adding too much bulk to your pack. The 650-fill DownTek insulation is premium down treated to resist moisture, so it keeps you warm even in damp conditions better than untreated down. Its mummy shape helps retain heat efficiently, and the jacket-style hood, insulated zipper, and 3D draft collar add extra warmth around critical areas. One standout feature is the expandable side panels, allowing you to customize the fit—either snug for warmth or looser for comfort—something not many bags offer.

The shell is made of durable, recycled polyester ripstop that balances toughness with light weight. When packed, the bag compresses down to a manageable size, fitting easily in most backpacks. The Padlok system to attach the bag to a sleeping pad and the Pillow Barn for securing a pillow are thoughtful touches for a steady, comfortable night's sleep. On the downside, although it is light, it’s not the absolute lightest in its category, and the price might be on the higher side due to its advanced features. Also, it’s designed primarily for solo users and colder conditions, so if you camp in milder weather or need a wider bag, this might feel restrictive. The water-repellent shell helps but don’t expect full waterproofing.

This bag suits individuals who prioritize warmth, adaptability, and lightweight performance on cold-weather backpacking trips.

The Sea to Summit Spark Ultralight Down Sleeping Bag is a solid choice for backpackers and outdoor enthusiasts who want a lightweight yet warm option for 2-season adventures. Weighing just under 2 pounds, it’s easy to carry on long hikes or bike trips without adding much bulk. With a 15°F (-9°C) temperature rating, it’s designed to keep you comfortable during chilly nights in spring, fall, or mild winter conditions. The high-quality 850+ fill power down insulation is treated to resist moisture, helping the sleeping bag maintain its warmth even if it gets a bit damp.

Its ultralight 10D nylon shell is water-resistant and breathable, so you’re less likely to feel clammy inside. The mummy shape provides a snug fit that keeps heat in but still allows some room to move naturally. YKK zippers ensure smooth opening and closing without snagging. One thing to consider is that the very thin shell material, while great for saving weight, might require extra care to avoid tears. Also, the 15-degree rating means it’s not ideal for very cold winter camping.

For those focused on minimizing pack weight while staying warm in moderate cold, this sleeping bag is a dependable option backed by a lifetime warranty. Its compact packed size makes it easy to stash in your pack, and the responsible down sourcing adds an ethical touch for environmentally conscious users.