The Nitrous is the perfect bag when every gram counts. It’s designed for use in summer or shoulder seasons, or can be paired with a Quest booster for year–round use. The mummy shape is generous, and filled with 800-850 loft Hydrophobic Down, it’s available in three temperature ratings (+2, -1 and -3°C ISO 23537.1 limit of comfort) and small, regular and large sizes. The lightweight downproof by construction 10 D Vapour Vent V2 fabric offers excellent breathability, durability and water repellence, while the full–length YKK #5 locking zip has an anti-snag slider and opens at both ends, allowing extra ventilation.  

  • Generous mummy shape maximises thermally efficiency without restricting movement or comfort
  • Box-wall baffles give maximum thermal efficiency
  • Vertical-V baffling system reduces down migration – keeping it trapped where you need it most
  • Differentially cut baffles promote full and complete lofting of down
  • Large foot-box reduces down compression while giving enough height for your feet and space to wriggle your toes
  • Three-quarter hood is contoured to cover your head comfortably and effectively
  • Full-length side zip from hood to ankle: a YKK #5 with locking slider and innovative, anti-snag cover
  • Selecting a zip side is easy: when lying in a sleeping bag, a left-hand zip (LH) is on your left side
  • Joined at the zip:full-length zips allow models with compatible left and right zips to be zipped together
  • Hydrophobic Down repels water, helping down stay lofty in all conditions
  • 800-850 loft Hydrophobic Down is premium, lightweight and ethically-sourced
  • Water-resistant thread is used to make a durable, well-sealed sleeping bag
  • Hang loops on the foot-box allow you to hang, dry and store your sleeping bag easily


  • Shell Fabric: 10 denier Vapour Vent V2. Downproof by construction, highly breathable, with C0, environmentally-friendly water repellent treatment
  • Lining Fabric: 10 denier Vapour Vent V2. Downproof by construction, highly breathable, with C0, environmentally-friendly water-repellent treatment (DWR)
  • Down Specifications: 800-850 loft, both tested by the IDFL. DWR water repellency
  • Zip Specifications: YKK. full-length zip. Small available in RH; Regular available with RH or LH; Large available in LH. Toggle glows in the dark
  • Intended Use: Lightweight Bushwalking / Cycle Touring
  • Season Rating: Two Season
  • Temperature Rating: Cold Sleepers & Women: 4C / Warm Sleepers & Men: -1C

Packed Volume:

  • Small: 4.5L
  • Regular: 4.5L
  • Large: 4.5L

Dimensions (user height / shoulder width):

  • Small: 177cm / 155cm
  • Regular: 187cm / 160cm
  • Large: 195cm / 178cm


  • Small: 504g
  • Regular: 541g
  • Large: 577g