[pct-l] Bubbles pop RE: Sleep System....UL vs recklessly light

[Diane at Santa Barbara Hikes dot com]

On Feb 7, 2009, at 8:48 AM, pct-l-request at backcountry.net wrote:

> Years ago, in the days before
> Thermarest, I hiked once with someone who had bought a sleeping pad  
> made
> of large (2-inch) bubble wrap. It had looked very comfortable.  
> However,
> all the bubbles popped by themselves before we reached 11,000 feet.  
> The
> altitude resulted in the air inside the bubbles being at much higher
> pressure than the air around us, so they exploded.

So that's what that noise was! And all this tine I thought it was  
rangers shooting bears who'd eaten people's food!