Camping Gear Reviews

Sea to Summit Spark Pro -9C/15F ultralight sleeping bag.

Review: Sea to Summit Spark Pro -9C/15F Sleeping Bag

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Ultralight Sleeping Bag
Sea to Summit Spark Pro -9C/15F Bag
$649, 1 lb. 11 oz./765.4g (regular)
Sizes: unisex regular and long ($689)
seatosummit.com

We woke up from our first night in Colorado’s San Juan Mountains in mid-September, at well over 10,000 feet beside a creek that sang soft lullabys to us all night, to find ice crystals in our water bottles and one full water bladder that had been left outside the tent partly frozen. But the overnight temperature dropping to below freezing had hardly registered with me as I slumbered soundly zipped up inside my Sea to Summit Spark Pro -9C/15F sleeping bag—one of the warmest for its weight, most packable, and well constructed ultralight sleeping bags you’ll find.

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The Marmot Hydrogen 30 ultralight sleeping bag.

Review: Marmot Hydrogen 30 Sleeping Bag

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Ultralight Sleeping Bag
Marmot Hydrogen 30
$399, 1 lb. 9.4 oz./720g (regular)
Sizes: unisex regular and long ($419)
backcountry.com

For backpackers prioritizing low gear weight who don’t tend to get cold very easily, a sleeping bag rated 30 degrees Fahrenheit can function as their go-to for most three-season trips. And Marmot’s Hydrogen 30 remains one of the perhaps three highest-quality and warmest ultralight mummy bags at this temperature rating, as I affirmed sleeping in it for two nights on southern Utah’s Owl and Fish canyons loop in early May, four nights in Montana’s Beartooth Mountains in August, and five nights on the Grand Canyon’s Gems Route in mid-April.

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Nemo Riff 30 Endless Promise sleeping bag.

Review: Nemo Riff 30 Endless Promise Sleeping Bag

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Sleeping Bag
Nemo Riff 30 Endless Promise
$360, 1 lb. 15 oz./879g (men’s regular)
Sizes: men’s and women’s regular and long
backcountry.com

Nemo’s Riff down sleeping bags have long carved out a unique space among high-end backpacking bags with their spoon shape and comfortable dimensions, as well as the zippered “thermo gills” on the chest area for adjusting the bag’s degree of warmth to vent on mild nights or batten down the hatches on chilly nights. Spending eight nights in the 2024 update, the Riff 30 Endless Promise, in Glacier National Park in September and in southern Utah in early October, I found that Nemo maintained or improved on the Riff’s exclusive features—while making the bags fully recyclable.

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The Therm-a-Rest NeoAir XLite NXT air mattress.

Review: Therm-a-Rest NeoAir XLite NXT Air Mattress

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Insulated Air Mattress
Therm-a-Rest NeoAir XLite NXT
$200, 11.5 oz./330g (size regular short, not including stuff sack or pump sack)
Sizes: four sizes from 20×66 inches/51x168cm to 25×77 inches/64x176cm
backcountry.com

Choosing the absolute lightest air mattress you find doesn’t always go well: The hours of sleep lost to discomfort may exceed the weight savings in ounces. Put another way, the personal energy lost through a poor night of sleep may eclipse what you gain from shaving a few ounces of pack weight. The latest iteration of Therm-a-Rest’s ultralight NeoAir XLite air mats, the NXT, will flip that equation to the positive side of the energy ledger for many backpackers, as it did for me on several spring and summer backpacking trips.

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The Mountain Hardwear Phantom 30 sleeping bag.

Review: Mountain Hardwear Phantom 30 Sleeping Bag

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Ultralight Sleeping Bag
Mountain Hardwear Phantom 30
$450, 1 lb. 6 oz./624g (unisex regular, 72-inch)
Sizes: unisex short ($440), regular, long ($480)
backcountry.com

Look at specs when shopping for a high-quality, ultralight, three-season sleeping bag and you might quickly trim your short list to about five models, all at basically similar weights and price points. But having slept in most of those top bags—and after sleeping in Mountain Hardwear’s Phantom 30 on cool nights on backpacking trips from a section of the Arizona Trail in the first days of April and camping at Idaho’s City of Rocks in June to the Canadian Rockies and Wind River Range in August—I place the Phantom 30 among the two or (maybe) three very best ultralight mummy bags for its strategic balance between low weight and excellent warmth. Here’s why.

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