Free 2-Day Shipping on Orders Over $50

Detail Images

  • Mountain Equipment - Detail
  • Mountain Equipment - Helium 400 Sleeping Bag: 23 Degree Down - Cosmos
  • Mountain Equipment - Detail -

Current Color

  • Mountain Equipment - Helium 400 Sleeping Bag: 23 Degree Down - Cosmos

Mountain Equipment Helium 400 Sleeping Bag: 23 Degree Down


Free 2-Day shipping on orders over $50. Learn More

Select a Size:

Select options
  • Select options
    • Reg/Left Zip

    Select a Color:

    Select options
  • Select options
    • Cosmos

    2 Reviews


    Efficient touring.

    Whether you define summer touring as bikepacking through Moab or backpacking through the Wind Rivers, the Helium 400 Sleeping Bag by Mountain Equipment is ultralight for carrying across multiple miles. The lofty down insulation keeps you warm during cool nights in the high desert and at high altitudes in the alpine through summer. Durable, yet lightweight Helium 20 denier fabric ensures protection against wind and traps in your body heat. And the baffled Gemini zipper and Lode Lock collar provides an extra prevention against heat loss. This thermal-efficient bag is designed to make for an efficient summer tour.

    • Lightweight sleeping bag for back and bike-packing
    • Technical material is lightweight and compressible yet tough
    • Material designed to retain heat and is wind-resistant
    • High-quality down insulation keeps you comfortably warm
    • Baffled zipper and lockable collar prevents heat loss
    • Waterproof roll-top stuff sack protects your bag from weather
    • Item #MEQ008T

    Tech Specs

    Helium 20D
    700-fill down
    full-length Gemini
    Shoulder Circumference
    Foot Circumference
    Bag Length
    [regular] 75in [x-large] 81in
    Draft Tube
    yes, Lode Lock closure
    Fill Weight
    European Norm Comfort Rating
    European Norm Lower Limit Rating
    Storage Sack
    Stuff Sack
    waterproof roll-top
    Stuff Size
    9 x 8 x 7in
    Claimed Weight
    1lb 14oz
    Recommended Use
    backpacking, weekend camping
    Manufacturer Warranty

    Tech Specs

    • Reviews
    • Q & A

    What do you think about this product?

    Have questions about this product?

    The best bag for the price

    • Familiarity: I've put it through the wringer

    Mountain Equipment has been doing down sleeping bags for half a century but only recently came to the US. As a result you probably haven't heard of them. That doesn't change the fact that they produce some of the best gear out there!

    If you've never had any Mountain Equipment gear before consider this bag the first first date of a very long and passionate relationship. If 700 fill power down and a waterproof stuff stack aren't enough to get you excited then consider the fact that Mountain Equipment has one of only two people in the world with a PhD in down helping them to design these bags.

    $250 may sound like a lot for 23 degree bag but here's the difference, this bag will actually keep you warm at 23 degrees. How do I know? Because I have personally used this bag at sub 30 degree temperatures and stayed warm while wearing no more than a light midlayer and my underwear. I talked my roommate into getting the women's version of this bag after she told me that she always has to put a hot water bottle in her bag at night to stay warm. After her first trip with this bag she said it was the best sleep she's ever had outdoors, and she didn't even need the water bottle. This 23 degree bag is warmer than most 0 degree bags.

    Obviously nothing is perfect and sadly this bag is no exception, although it comes remarkably close. The bag is built with an alpine fit which basically means tight. This helps keep the weight and pack size low but also but also means that if you've got a large frame or are an exaggerated side sleeper (like you tend to get your knees all up in your tent mates business) you'll likely find this bag to be a little restrictive and maybe even a little cold as you may compress the down by pushing on the walls. But for an average sized person with an average sleep position it is very hard to find a flaw with this bag.

    Overall, are there better sleeping bags out there? Yes.

    Is there a better bag at the same price? Not that I've found.

    If you have questions about his review please feel free to email me!

    Awesome Bag

    • Familiarity: I've used it several times

    This bag is super comfortable and warm. I hiked King’s Peak in early August and this bag kept me feeling good. It is pretty light and packs down nice and small making it great for a back packing trip. The Mummy design can really seal you in and trap the heat if the wind picks up and the temps drop.