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The Helium 400 is an incredibly light, versatile and packable sleeping bag well suited to backpacking, cycle touring, and cooler spring/summer nights.
The Helium 400 is an incredibly light, versatile and packable sleeping bag well suited to backpacking, cycle touring, and cooler spring/summer nights.
Mountain Equipment

Mountain Equipment Helium 400 Regular

£245.00
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Pre-Order

With Pre-Order, you can purchase the latest items added to our store in advance of them arriving with us.

Your Pre-Order is prioritised (at no additional charge); meaning that as soon as the product arrives with us, we can wrap it straight back up; ready for collection via Click & Collect or despatch to you — it often never even hits the stock room shelves!

Pre-Launch

With Pre-Launch, the date when we expect to receive the product ourselves is still a little too hazy to be confident in accepting Pre-Orders.

So, instead, you can submit your email address against the item you are interested in and we will email you as soon as stock arrives on the system.

Estimated Delivery & Collection Dates

Estimated Delivery & Collection Dates are given on Pre-Order and Pre-Launch products. They are for indication purposes only and can change at any time without notice.

The dates we provide are based on indications given by our suppliers. Whenever we get updated information from our suppliers we will endeavour to update the Estimated Delivery & Collection Dates provided on product pages.

We estimate this will be ready for despatch to you or collection via Click & Collect on Undetermined
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When you purchase this item, you will earn of rewards points to spend on your next purchase from us. You can spend your Rewards balance in-store & online.

Hassle free returns

You can return a product for a full refund or exchange within 28 days.

For any items purchased on or after 15th October 2026, we currently have an extended Christmas returns period until 15th January 2027, so you can return or exchange any Christmas gifts.

The return process is simple. All you need to do is fill out the Return/Exchange form that was included with your order. On that form, it has our return address and instructions. The item(s) must be returned in a new and unused condition, along with its original labels and the return/exchange form filled in describing the reason for return.
Please ensure your order number is written on your return/exchange form, so we can identify your return.
You can also access the returns form
here.

We do not cover the cost of return postage. We recommend sending it back to us via a Royal Mail Tracked service to guarantee safe delivery, they should also supply you with a tracking receipt.

You can arrange Royal Mail postage (including free collection in most areas) via this link: ​https://send.royalmail.com/

Please note we will only refund the original card used, Countryside does not provide cash refunds unless you purchased by cash in store.

For hygiene reasons, Countryside cannot accept underwear garments for refund or exchange unless they have not been worn.

Return Address:

Web Returns

Countryside Ski & Climb

118-120 High Street

Stevenage

SG1 3DW

Faulty Items

If an item is faulty, please contact us as soon as possible, and we will arrange for the item to be returned to us, at our cost. Where a product is found to be faulty, we will exchange the item or provide a full refund.

Mountain Equipment Helium 400 Regular

Season:AW26

Brand:Mountain Equipment

Code:ME-005968-ME-01635

The Helium 400 is an incredibly light, versatile and packable sleeping bag.

Well suited to backpacking and cycle touring, it will still happily cope with cooler nights during the spring and summer months.

Features:

  • 100% recycled HELIUM 20D outer shell is very light and highly breathable with PFC free DWR
  • 403g of 90-10 Pure Duck Down with a minimum fill power of 700
  • Alpine Fit 2.0 improves comfort and maximises thermal efficiency
  • Slanted box-wall baffles throughout
  • Mid-level side seams
  • 5 baffle anatomically shaped hood
  • 4 baffle anatomically shaped and offset foot-box
  • Full length Gemini zip baffle with 140cm zip and integrated neck collar with Lode Lock closure
  • 100% recycled Supersoft 20D lining fabric with PFC free DWR
  • Supplied with waterproof roll-top stuff-sack and storage cube
  • 100% Polyamide outer/inner, Down fill

Temperature Ratings (EN13537/ISO23537):

  • Comfort: 0°C (32°F)
  • Comfort Limit: -6°C (21°F)
  • Extreme: -24°C (-11°F)
Technical Information
  • Total bag weight
    820g
  • Good night's sleep temperature
    -5°C
  • Total fill weight
    403g
  • Packed dimensions
    24 x 21 x 20 cm
  • Outer shell
    100% recycled HELIUM 20D with PFC free DWR
  • Fill
    90-10 Pure Duck Down (700 fill power)
  • Fit
    Alpine Fit 2.0
  • Construction
    Slanted box-wall baffles, mid-level side seams, 5 baffle anatomically shaped hood, 4 baffle anatomically shaped and offset foot-box
  • Zip
    Full length Gemini zip baffle (140cm)
  • Closure
    Integrated neck collar with Lode Lock closure
  • Lining
    100% recycled Supersoft 20D with PFC free DWR
  • Included
    Waterproof roll-top stuff-sack, storage cube
  • Material
    100% Polyamide outer/inner, down fill
Sizing Information

Mountain Equipment Gloves Size Guide

Mountain Equipment glove sizing is based on hand circumference. Use the measurements below to find the most suitable glove or mitt size.

Glove & Mitt Sizing

SizeMenWomen
XS18.5–19.5 cm (7–7.5 in)16–17.5 cm (6–7 in)
S19.5–21 cm (7.75–8.25 in)17.5–18.5 cm (7–7.5 in)
M21–22 cm (8.25–8.75 in)18.5–19.5 cm (7.25–7.75 in)
L22–23 cm (8.75–9.25 in)19.5–20.5 cm (7.75–8 in)
XL23.5–24.5 cm (9.25–10 in)—
XXL24.5–25.5 cm (10–10.75 in)—

How to Measure Your Hand

Hand Circumference With your palm facing up, measure around the widest part of your hand, excluding the thumb, with your fingers in a relaxed position.
Measuring Tip Keep the tape snug against your hand but not restrictive.
Professional Opinion
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