VBL bag

Vapour Barrier Liner. Prevents evaporation from inside entering down insulation and forming ice crystals.
For clothing, weight is for size: M. For sleeping bags, weight changes with selected length/width. N.B. there may be some variation in the weights of finished products.
280g / 10oz
Vapour Barrier Liner Sleeping Bag


  • Cut wide enough to go inside our expedition sleeping bags
  • Fabric: Non-breathable nylon to prevent evaporation getting to the down
  • Fully taped seams
  • Short side opening (left side) for easy entry/exit with Velcro closure
  • Full mummy hood to protect sleeping bag
  • Stuff sac
  • Pack size: 10 x 18cm*
  • Option: Short and Long lengths


*Please note: We make our stuff sacs big enough to allow fairly easy stuffing rather than reducing the bag to the tightest minimum.


Vapour Barrier Liner for use inside sleeping bags in very cold conditions: prevents evaporation from entering and icing up inside the down layer. An item of well proven value on many expeditions. For certain types of expedition, such as long journeys in northern polar regions, a simple VBL may be insufficient. If you have any doubts about your particular needs please discuss them with us.

Read our technical briefing on Vapour Barrier Liners.

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