Sierra Designs Night Cap 35 Synthetic Sleeping Bag

-1.6°C Comfort Limit (EN13537:2012), 558g of SierraLoft Eco Synthetic Insulation
Weighs 1068g (Regular bag)
Code: SS21257V
  • From £129.99
  • (FREE Delivery on orders over £15)
  • RRP £134.99
+ In Stock Now | Usually dispatched within 24 hours

The Night Cap is based on the hugely popular Cloud with the same innovative zipless opening with oversized comforter really works especially for people who move around during the night, people looking for extra room and quick temperature control.

Sierra Designs says:

Based on our bestselling Cloud, but now in a lower cost, fully recycled synthetic package, the Night Cap features a zipperless design with an integrated comforter for all the comforts of home in the backcountry. The Night Cap also incorporates our patented self-sealing foot vent and a pad sleeve, allowing increased ventilation for hot sleepers and movability for wiggle worms, side, and stomach sleepers.

| Click here for more info on Sierra Designs, their history, philosophy and information on how they support their mission to get everyone 'outside'.

Sierra Design's Night Cap is the synthetic fill version of the unique Cloud 800 sleeping bag. There are a number of practical features that you only truly appreciate once you're using the bag. The zipless, quilt style opening that wraps around you seems like a gimmick until you get to enjoy how easily you can get in and out of it. The opening has an oversized comforter which acts like a quilt so you can really wrap yourself up in it if the temperatures drop. Alternatively you can quickly and easily open it up to dump heat if you're too hot.

The bottom of the bag has a generously sized sleeping mat sleeve that keeps your mat in place through the night even if you move around a lot. The best aspect of the bag for me personally 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 Cloud 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 558g of SierraLoft Eco Synthetic Insulation that has a -1.6°C Comfort Limit so its good for two to three season use, particularly if you're a warm sleeper. The fabrics used are 20D so they are lightweight but also more durable than many of the lightest bags out there. The dimensions of the bag are generous so it would suit someone after a larger bag, someone who moves around a lot at night and warm sleepers. The overall weight is really impressive given all the features too.

- Reviewed by Ultralight Outdoor Gear

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
  Sleepin bag features page 2
  • Patent pending zipperless design for the ultimate comfort
  • Oversized integrated comforter gives you all the comforts of your bed at home
  • Insulated shoulder pockets keep comforter wrapped around you and seals out drafts
  • Patented self-sealing foot vent provides fast and easy ventilation
  • Integrated sleeping pad sleeve keeps pad under you for comfort and warmth
  • Hood cinch to keep in heat when the temps drop
  • Recycled materials reduce environmental impact
  • ISO tested
  • Stuff sack included for easy pack up and transport

Temperature Rating

  • Temperature Rating: 35°F / 1.67°C
  • ISO Comfort Rating: 39°F / 2.22°C
  • ISO Limit Rating: 29°F / -1.67°C

Regular Specs

  • Weight: 1068g (excludes storage bags)
  • Fill Weight: 24 oz /680.39 g
  • Fits Up To: 72 in / 183 cm
  • Length: 78 in / 198 cm
  • Shoulder Circumference: 60 in / 152 cm
  • Hip Circumference: 58 in / 147 cm
  • Footbox Circumference: 40 in / 102 cm
  • Stuff Sack Size (L x W): 7.5 x 15" / 19 x 38cm

Long Specs

  • Weight: 1164g (excludes storage bags)
  • Fill Weight: 26 oz / 737.09 g
  • Fits Up To: 78 in / 198 cm
  • Length: 84 in / 213 cm
  • Shoulder Circumference: 62 in / 157 cm
  • Hip Circumference: 60 in / 152 cm
  • Footbox Circumference: 42 in / 107 cm
  • Stuff Sack Size (L x W): 7.5 x 15" / 19 x 38cm


  • Insulation: SierraLoft Eco Synthetic Insulation
  • Shell Fabric: 20d Recycled Nylon Ripstop
  • Liner Fabric: 20d Recycled Nylon Taffeta
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