Sierra Designs Nitro 800 20 Degree Down Sleeping Bag

-9°C Comfort Limit, 418g of 800 Fill Power DriDown
Weighs 842g (Regular bag)
Code: SS20730V
  • From £349.99
  • (FREE Delivery on orders over £15)
  • RRP £374.99
+ In Stock Now | Usually dispatched within 24 hours

The Nitro 800 is a lightweight, warm bag designed around the traditional mummy bag but with a few unique features that make Sierra Designs bags stand out. Great value for a bag with this much going on.

Sierra Designs says:

A lightweight mummy with some tricks up its sleeve, the Nitro brings the classic mummy shape back at an impressively low weight, with incredible comfort. With a simple construction and lightweight materials, the Nitro comes in punching above its weight class, and still features our self sealing foot vent for comfort.

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Sierra Design's Nitro 800 20 Degree Down Sleeping Bag is a traditional style mummy bag that is lightweight, warm and has a couple of extra features that make it stand out from the crowd. The baffle design allows the down to loft really well and a decent half length zip makes for easy access. There is a really effective draught collar that hugs your shoulders to keep the heat in and the cold out.

The most unique feature is the self sealing foot vent. I get hot feet so restrictive mummy bags are often uncomfortable due to feet that are overheating. On the Nitro you can easily slide your feet out of the vent on the bottom to cool off or just let air in. Due to the placement of the vent and the overlapping materials, as soon as your feet are inside there no chance of cold air getting in or your feet accidentally getting out. An ingenious design feature.

This version has 418g of 800 Fill Power DriDown that has a -2°C Comfort Limit so its good for two to three season use, particularly if you're a warm sleeper. The fabrics used are 15D so they are lightweight but also more than many of the lightest bags out there. The dimensions of the bag are more generous than most traditional mummy designs. The overall weight is really impressive given all the features too.

- Reviewed by Ultralight Outdoor Gear

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Help and advice: Choosing a sleeping bag advice
  EN 13537 rating for sleeping bags explained
  Sleeping bag shape and sizes advice
  Sleeping Bag features Page 1
  All about down filling in sleeping bags
  • PFC-Free 800FP Dridown and 15d nylon fabrics / ultralight weight
  • Patented Self Sealing foot vent / fast and easy ventilation
  • Draft-dodger collar / helps prevent drafts
  • 5" baffle spacing and side wall baffles / helps to keep down from shifting keeping you warmer
  • Anti-snag zipper tracks / makes getting in and out easy

Temperature Rating

  • EN Limit Temp Rating:  17F / -9C
  • EN Comfort Temp Rating:  28F / -2C

Regular Specs

  • Weight: 842g (excludes storage bags)
  • Fill Weight: 14.7 oz / 418 g
  • Fits Up To: 6' 0" / 183 cm
  • Length: 78in / 198 cm
  • Shoulder Circumference: 62" / 157 cm
  • Hip Circumference: 56" / 142 cm
  • Footbox Circumference: 40" / 102 cm
  • Mesh Stoarge Bag Size (LxW): 20 x 12" / 51 x 31 cm
  • Stuff Sack Size (L x W): 15 x 7.5" / 38 x 19cm

Long Specs

  • Weight: 906g (excludes storage bags)
  • Fill Weight: 16.3 oz / 463 g
  • Fits Up To: 6' 6" / 198 cm
  • Length: 84in / 213 cm
  • Shoulder Circumference: 64" / 163 cm
  • Hip Circumference: 58" / 147 cm
  • Footbox Circumference: 42" / 107 cm
  • Mesh Stoarge Bag Size (LxW): 20 x 12" / 51 x 31 cm
  • Stuff Sack Size (L x W): 15 x 7.5" / 38 x 19cm


  • Insulation: 800FP PFC-Free DriDown
  • Shell Fabric: 15d nylon risptop
  • Liner Fabric: 15d nylon risptop
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