Home > Gear, Skills, ultralight bicycle touring > Thermo-Lite 2.0 Bivvy Sack Review or How to Survive Sleeping in a Hammock

Thermo-Lite 2.0 Bivvy Sack Review or How to Survive Sleeping in a Hammock

Hammocks are a great way to reduce pack or pannier weight.  With no need to carry a sleeping pad, tent poles, ground cloth or a lot of tent stakes, a good hammock sleeping set-up can weigh less than two pounds.  I find them to be extremely comfortable and relaxing and when a gentle breeze gets the thing rocking you can have a sleeping experience common ground dwellers envy.

But that gentle breeze can be a serious problem.  All that air-flow around the body carries away body heat.  Even in mild climates you can become too chilled to be comfortable.  If the temperature drops in the middle of the night to mid-fifties or below, it can become downright dangerous.  I notice the cold most in the hip area where my sleeping bag’s loft has been the most compressed. 

So, here are two things I’ve found helpful. 

  • One, reduce the airflow around the body.  Add an additional tarp or poncho over the ridgeline, wear extra clothing and/or zip-up your sleeping bag as the temperature drops. 
  • Two, add some form of insulation underneath your shoulders and hip area.

Adventure Medical Kits’ Thermo-Lite 2.0 bivvy sack is a product that does both of these fairly well and weighs less than 7 ounces. The 2.0 is manufactured with a non-woven, reflective fabric that has a napped inner surface.  It’s reusable, easily repaired (with duct tape) and cost around 30 dollars. Pair this with a sleeping bag liner or very light summer bag if needed.  It’s waterproof, windproof and promises to reflect up to 80% of your body heat.  It’s long enough for most folks to pull over the head and Velcro closed, but don’t.  If you breathe inside the bivvy it will become clammy and damp. And that is the only downside; becoming too warm and clammy.  The 2.0 features a vented foot and a generous Velcro opening to help control moisture.  I bought mine from Campmor.

Thanks for reading, Jack

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