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WarmCube Expedition, long

by Marmot
WarmCube Expedition, long
SKU: marmot-31800-3567-LZ

For maximum warmth combined with added durability, this bag features WarmCube technology putting cozy down cubes next to the body, and waterproof breathable fabric around the head and feet areas.

$ 589.00
$999.00 Save 41%
+ Free ground shipping!


When the temperature drops to arctic levels, reach for the WarmCube™ Expedition Sleeping Bag - Long. The 800-fill-power down, synthetic HL-ElixR Micro™ insulation, and Pertex Quantum® shell fabric combine to provide superior coverage for summit bid-worthy adventures. Protected by a water-resistant layer of overlapping baffles, innovative 3D WarmCube construction prevents down fill from being displaced and traps heat in the surrounding channels so you stay warm—no matter what. An anatomically designed footbox, the two-way YKK zipper with a down-filled draft tube, and a cinchable draft collar and hood further limit heat loss.


  • 800-fill-power down with WarmCube™ technology in internal layer for maximum warmth; synthetic HL-ElixR Micro™ insulation in outer layer for high loft
  • Durable and water-resistant Pertex® Quantum shell exterior; Pertex Shield fabric strategically placed around head and footbox for moisture protection
  • Anatomically designed footbox with wraparound construction increases warmth
  • Two-way, full-length locking YKK zipper with down-filled draft tube reduces heat loss
  • Cinchable draft collar and hood with easy-to-adjust "feely" drawcords block drafts and trap warmth
  • Internal stash pocket

Detail Photo(s)

Tech Specs

Bag Temperature F: -30° F
Bag Temperature C: -34° C
Weight: 6lbs 14oz (3120g)
Main Fabric : Pertex Quantum© 46% 15d Y-yarn Recycled Nylon, 54% 30d Diamond shape Nylon Ripstop 1.2 oz/yd
Secondary Fabric : Pertex Shield 30d 100% Nylon 2.3 oz/yd
Lining Fabric : Pertex Quantum© 100% Recycled Nylon Ripstop 0.8 oz/yd
Insulation Type: Down / Synthetic
Insulation Material: 800+ Fill Power Goose Down / ElixR Micro
Insulation Power: 800
Fill Weight: 53oz / 39oz (1500g / 1100g)
Zipper Location: Left
Shape: Mummy
Fits up to: 6' 6" (198 cm)
Shoulder Girth: 65in (165cm)
Hip Girth: 61in (155cm)
Footbox Size: 47in (119cm)
Includes Stuff Sack: yes
Stuff Sack Size: 9 x 19in | 24 x 48 cm
Stash Pocket: yes