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Ultra 80 is the highest performance synthetic sleeping bag available using PrimaLoft® Gold to give a 5°C sleep limit and a tiny pack size. Inspired by ultra racing, it's ideal for fast and light adventures when weight, reliability and a small pack are crucial. Highly compressible and weighing just 490g, Ultra 80 fits easily into bikepacking bags and mountain marathon packs. We've used PrimaLoft® Gold, the highest quality 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.


PrimaLoft® Gold insulation

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

Ultralight construction

80gsm 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: 5°C / 41.0°F


Fill: PrimaLoft® Gold, 80gsm
Fabric: 20D nylon
DWR: PFC-free C0
Baffles: Stitch-through


Packed size: 19cm x 15cm (Regular) / 19cm x 16cm (Long)
Internal length: 190cm (Regular) / 210cm (Long)
Internal width: 75cm
Zip length: 60cm


Sleeping bag: 495g (Regular) / 525g (Long)
Stuff bag: 15g

*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

PFC-free DWR

Ultra 80 uses a PFC-free DWR treatment on its outer fabric. PFCs are potentially harmful and have been found to build up in the environment

Recycled content

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

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 80 in action