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Warmcube Expedition Sleeping Bag: -30F Synthetic

4.8 out of 5 stars
5 Reviews

Out of Stock

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Why We Like The Warmcube Expedition Sleeping Bag

Marmot's Warmcube Expedition Sleeping Bag is tough on the outside and soft on the inside, which is perfect to keep us nice and cozy when we're fending off extreme climates on expeditions. Rated for subzero climates, this bag boasts an internal layer insulated with 800-fill down insulation for a light and lofty feel, and the outer shell is insulated in ElixR Micro synthetic to stay warm even if the bag gets wet. The shell's body is wind- and water-resistant Pertex Quantum fabric, and the Pertex Shield hood and footbox offer waterproof, breathable protection.


  • -30F rated sleeping bag built for expeditions and winter camping
  • 800-fill down insulated internal layer in a cubed pattern for loft
  • ElixRMicro insulated outer layer provides better weather protection
  • Pertex Quantum shell is breathable, wind- and water-resistant
  • Pertex Shield hood and footbox are waterproof and breathable
  • Adjustable hood and draft collar customize coverage
  • Full-length, two-way zipper with draft tube to reduce heat loss
  • Internal pocket provides storage to keep electronics warm
  • Item #MARZ9HA
Responsible Collection
[face fabric] Pertex Quantum (46% 15D recycled nylon 54% 30D nylon ripstop), [base] Pertex Shield (100% 30D nylon), [lining] Pertex Quantum (100% recycled nylon ripstop)
800+-fill down, ElixR Micro
YKK, 2-way, full-length
Max User Height
[long] 6ft 6in [regular] 6ft
Shoulder Circumference
Hip Circumference
Foot Circumference
Bag Length
[long] 6ft 6in [regular] 6ft
Draft Tube
[internal] 1 stash
Pad Retainer
Fill Weight
[internal] 3lb 5oz, [outer] 2lb 7oz
Storage Sack
not included
Stuff Sack
Stuff Size
9 x 19in
Claimed Weight
[long] 6lb 14oz [regular] 6lb 1.5oz
mountaineering, winter camping
Manufacturer Warranty

Overall Rating

5 based on 5 ratings

Review Summary

1 Stars - 0 reviews
2 Stars - 0 reviews
3 Stars - 0 reviews
4 Stars - 1 reviews
5 Stars - 4 reviews

What do you think about this product?


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5 out of 5 stars

November 9, 2022

Bulky but worth it

[This review was collected as part of a promotion.] Very warm, perfect for winter! Especially if you are easy to get cold like me. My 10yr old son loved it, too.


Originally reviewed on

5 out of 5 stars

October 28, 2022

No more cold nights

[This review was collected as part of a promotion.] Amazing warm. I jumped right in out of the box. Can't wait to spend a night in the cold


Originally reviewed on

5 out of 5 stars

January 13, 2022

Warm cube

Awesome so far. hasn't tested the deep temperatures but have faith in it.

Originally reviewed on

5 out of 5 stars

June 24, 2021

Excellent bag, but be mindful of the size

[This review was collected as part of a promotion.] While I have not had the chance to put it through its full paces just yet (ordered in high summer, looking forward to winter), the bag itself is very comfortable and well made. The WarmCube technology keeps the down where it is supposed to be and I expect it to keep me warm on the coldest nights. I am happy with my purchase. But keep in mind that just like another reviewer said here it is big and will not comfortably compress down to fit into a standard backpack. The down and construction will not allow for it, it is truly an expedition bag. Be prepared for this contingency and this bag will be your go-to on very cold nights.


Originally reviewed on

4 out of 5 stars

November 16, 2020

High performance bag too large for backpacking

[This review was collected as part of a promotion.] Believe them when they say it’s an “expedition bag”. It is massive. It also comes with a giant stuff sack about 40L in capacity. This said, it is not ideal for backpacking and more geared towards base camp setups and packing in on a sled or mule pack. It would not comfortably fit in my 95L pack even when compressed as much as I could get it. I returned it for the CWM -40 but it was clear that this bag is an extremely high performance bag for the most demanding conditions. The WarmCube design is neat. The Pertex shell seems really good. I would recommend it, but keep in mind that it is an expedition bag, not a bag that will easily be backpackable.


Originally reviewed on