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Best Ultralight Sleeping Bags

Minimum weight for serious gram-counters, thru-hikers, and fastpackers

Showing 8 ultralight sleeping bags

Under 2 lbs Kelty SB35
Kelty

TraiLogic SB 35 Women's 800-Fill DriDown

35°F Rating 800 Fill Down 1 lb 10 oz
★★★★★ 4.6 (234 reviews)

Just over 1.5 lbs with 800 fill DriDown to ward off moisture. True ultralight performance.

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800 Fill Kelty Cosmic Ultra
Kelty

Women's Cosmic Ultra 20 Deg 800 DriDown

20°F Rating 800 Fill DriDown 2 lbs
★★★★★ 4.5 (312 reviews)

Premium 800 fill at exactly 2 lbs. Women's-specific fit with trapezoidal baffle construction.

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Best Value Kelty Galactic
Kelty

Galactic 30 Deg 600 DriDown Backpacking

30°F Rating 600 Fill DriDown 2 lbs 3 oz
★★★★☆ 4.4 (423 reviews)

600 fill DriDown treated for water resistance. Excellent value for ultralight backpacking.

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Editor's Choice Kelty Cosmic 20
Kelty

Cosmic 20 Degree 550 Down Fill Sleeping Bag

20°F Rating 550 Fill Down 2 lbs 6 oz
★★★★★ 4.7 (1,890 reviews)

Best balance of warmth, weight, and price. Recycled PFAS-free materials.

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Hewolf
Hewolf

Down Sleeping Bag Mummy Cold Weather

Cold Weather 800g Down Fill 2.5 lbs
★★★★☆ 4.3 (189 reviews)

Lightweight waterproof down bag. Excellent warmth-to-weight for cold weather ultralight trips.

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Budget UL Nature Link
Nature Link

Lightweight Mummy Sleeping Bag 42-55°F

42°F - 55°F Synthetic 2.87 lbs
★★★★☆ 4.1 (234 reviews)

Budget-friendly ultralight option. Compresses to just 13" height for easy packing.

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Hybrid Klymit KSB
Klymit

KSB Lightweight Mummy Sleeping Bag 20°F

20°F Rating 650 Down/Synthetic 2 lbs 13 oz
★★★★★ 4.5 (567 reviews)

650 power fill down on top with synthetic on bottom. Innovative hybrid design.

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Premium Marmot Teton
Marmot

Women's Teton 15° Sleeping Bag 650 Fill Down

15°F Rating 650 Fill Down 2 lbs 13 oz
★★★★★ 4.7 (156 reviews)

Strategic down baffling with draft tube. Dual side zips for temp regulation.

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Ultralight Sleeping Bag Guide

For thru-hikers, fastpackers, and anyone who counts every gram, an ultralight sleeping bag is essential. These bags sacrifice some comfort and durability for significant weight savings, typically weighing under 2 lbs.

Ultralight Strategies

  • High Fill Power Down: 800+ fill power offers best warmth-to-weight
  • Minimal Features: Skip draft tubes, pockets, and extra zippers
  • Ultralight Fabrics: 10-15 denier shells reduce weight significantly
  • Consider Quilts: Backless quilts can save 8-12 oz over mummy bags
  • Tight Fit: Mummy bags with narrow cuts are lighter
Trade-offs: Ultralight bags often use thinner shells that are less durable. Handle with care and avoid sharp objects.

Weight Categories

  • Ultralight: Under 2 lbs (32 oz)
  • Very Light: 2-2.5 lbs (32-40 oz)
  • Lightweight: 2.5-3 lbs (40-48 oz)