Quick Overview

Extra large sleeping bag extender.

Filled with high quality 680+ loft duck down, the Mont Hotwire will boost the warmth of your sleeping bag by up to 10°C. You could also use it as lightweight travel bag or for summer bushwalking.

The Hotwire is only available with a left zip. For use as a liner bag with a right zip sleeping bag simply turn your Hotwire Extender inside-out!


  • 680+ loft duck down
  • Reversible design for left and right handed use
  • Flexible distribution of down between canopy and base
  • Hood with drawcord
  • Lightweight, downproof 30D nylon taffeta shell
  • Double slider continuous coil zip
  • Minimum Comfort Temperature +2°C

    Tech Specs


    Liner bag/summer


    Tapered rectangular

    Fill weight

    300 g

    Fill type/loft

    Duck down, 680+ loft

    Shell Fabric

    30D nylon

    Inner Fabric

    30D nylon

    EN13537 Comfort Temperature


    EN13537 Lower Limit Temp


    EN13537 Extreme Temperature


    Dimensions/Max User Height

    200 cm



    Total weight

    690 g


    Extra Info

    Stuff sack

    Cordura sil-nylon compression stuff sack


    Sewn-through down chambers


    Full length + foot

    WA Update Dec 2022: Delays of several weeks due to extreme weather and rail closure. Express Post is your fastest option.

    Standard/Free shipping to major capitals takes 2-5 business days, with occasional delays due to Covid.

    Order before 11am - we usually ship the same business day!

    Choose Express Post for priority packing and faster shipping.