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Ultra 120 is the highest performance synthetic sleeping bag available using PrimaLoft® Gold to give a 1°C sleep limit and a tiny pack size.

Inspired by ultra racing, it's ideal for fast and light adventures when weight, reliability and small pack size are crucial.

Highly compressible and weighing just 580g, Ultra 120 fits easily into bikepacking bags and mountain marathon packs. We've used PrimaLoft® Gold, the highest quality of synthetic insulation available, for its excellent warmth-to-weight ratio. PrimaLoft® is water repellent too, staying reliably warm on longer trips when you can't guarantee to keep your sleeping bag dry.

Wrap yourself in gold.


PrimaLoft® Gold insulation

The highest qualit synthetic insulation available for the best warmth-to-weight ratio

Ultralight construction

120gsm PrimaLoft® Gold, ultralight 20D nylon fabric and a half-zip to save weight without compromising on warmth

Reliable damp performance

Water repellent PrimaLoft® insulates even when damp and dries quickly. The outer fabric is PFC-free DWR treated

Tapered mummy shape

Thermally efficient shape with room for clothes and a liner to tailor your sleep system to the conditions

Product overview

  • High warmth-to-weight ratio PrimaLoft® Gold
  • Water repellent PrimaLoft® insulation
  • Lightweight and compressible construction
  • Tapered mummy shape with room for clothes
  • PFC-free DWR treated outer fabric
  • Adjustable hood and collar
  • Half zip saves weight
  • Full length zip baffle
  • 3 year Alpine Bond

Technical details

Temperature Rating

Alpkit sleep limit: 1°C / 33.8°F


Fill: PrimaLoft® Gold, 120gsm
Fabric: 20D nylon
DWR: PFC-free C0
Baffles: Stitch-through


Packed size: 22cm x 15cm (Regular) / 22cm x 16cm (Long)
Internal length: 190cm (Regular) / 210cm (Long)
Internal width: 75cm
Zip length: 60cm


Sleeping bag: 580g (Regular) / 640g (Long)
Stuff bag: 20g

*Our recommended usable limit of the bag. The majority of our customers will find this to be the tipping point between a comfortable and restless night's sleep.

Sustainability & Care

Environmental impact

Recycled content

PrimaLoft® Gold is made from 55% recycled polyester, from post-consumer sources

PFC-free DWR

Ultra 120 uses a PFC-free DWR treatment on its outer fabric. PFCs are potentially harmful and have been found to build up in the environment

Care instructions

Storage: store your sleeping bag uncompressed in a cool, dry place. This will extend its life and allow it to regain its loft quicker after unpacking.


Ultra 120 in action