Tag Archives: vapor barrier

Rescue Bivysack/VBL


Used by Search and Rescue Skiers as a compact and quick tool to get a wet person out of the wind and wet. Wind and waterproof coated nylon sack stops evaporative and convective heat loss for the whole body in a super tough and compact 7 ounce package. The orange colors make a good signaling device and wind sock. Dimensions 85″ length, 71″ shoulder girth, 48″ inch foot girth. Can be compacted to fist size. Also works well as a roomy vapor barrier liner inside a sleeping bag to prevent condensation in the insulation.  Silicone coated 30d type 66 nylon in either blaze orange or black. Group discounts available. Call 888-292-4534 for more info.

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Filed under bivysack, Oware Backpacking Gear, sleeping bag liners, Tips for the Backcountry

Vapor Barrier Liners, More


Just before Goretex burst on the scene, VBL’s
were more popular as they greatly enhanced the
usefulness of coated fabric rain gear etc. The most
popular undergarment of the time was the large
opening cotton string shirt. This worked really well
as it kept the VBL far from the skin but didn’t
have a lot of fabric for absorbtion. Even better
were the expensive wool versions.

One combination I have used with success is a half
bag of silnylon for the legs and waist when sleeping
combined with a VBL jacket. This way your feet
stay warmer than using VBL pants as heat from your legs can more easily reach them. It also can
double as a pack liner.
The jacket can be worn during the day and with the advantage of enabling you to layer coats over the top of the VBL for both sleeping and hiking.
I have found that a VBL jacket over long johns was comfortable with no noticable moisture buildup when hiking in sub zero weather
and balancing my outer layers
to keep from overheating.

Climbers on Denali wear
VBL vests under down gear when climbing to keep
their insulation layers dry next to their backs.

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Filed under Oware Backpacking Gear, Tips for the Backcountry

Elephant’s foot sleeping bag Vapor Barrier Liners


Been curious about using a VBL (vapor barrier liner)? Here is an inexpensive and light way to learn about their advantages.

Bring this shorty VBL on your next cold weather trip. At night use it inside your sleeping bag to add warmth.

For cold conditions, wear over long underwear and inside sleeping bag to retain heat and limit insensible perspiration. This will keep your sleeping bag dryer, hence lighter and warmer and also reduce the amount of fluids lost by the body at night, so you have to drink less (melt less snow too). Especially good on extended trips where it is difficult to dry the sleeping bag each day. Also carried by mountaineers and search and rescue team members for quick emergency shelter ( it slows heat loss due to evaporation, convection and radiation).

Possible other uses include slowing heat loss in emersion cases, as a wind sock for helicopter evacuations, as a pack liner, as a solar still, or to keep your bottom half out of wind and weather when on a stand or bivy ledge. Very compact and light. Folds to fist size.

This version is a half bag, just 52″ long.  Made of silicone coated 30d nylon it is sturdier than a trash bag, plastic or mylar versions. Weighs under 4 ounces so there is no great weight penalty to bring it along and in fact your sleeping bag will not pick up as much condensation weight over time. And with a half bag, you can still wear an insulated coat on your top half. Just snug the elastic cord around your waist. Your feet will get warm air flow too, unlike  socks which isolate the feet.

Custom sizes available.

Made in the USA of USA fabric.

Colors, black, blaze orange, olive, silver

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Filed under Oware Backpacking Gear, sleeping bag liners