I remember our first long RV trip took us to over 8,000 feet in Wyoming and later into Colorado and New Mexico to more higher elevations.  We learned that shampoo bottles and such can behave in interesting ways when taken from close to sea level to high elevations, especially when they are not very full so the air inside expands.
You would think we would have learned with all the mountain travel we have been on over the years but just today Diane cleaned up a mess from some hand lotion that had spurted its scented contents under the sink.  Over the years we have had problems with shaving cream, shampoo, dish washing liquid and once had a water spill where a gallon jug was only partly full and the plastic cracked from the altitude changes.
Going to lower elevation can also cause us to jump when a mostly empty and closed plastic bottle will make a loud sound when it collapses. 
We live with the challenges that altitude changes give us since higher altitude areas are very scenic, they are on the travel route across the continent, and higher altitude places are cooler in summer.  We adjust our Select Comfort bed when we stop, we live with going slower uphill, we live with lower fuel mileage, and we live with the little adventures like hand lotion spills. 
By the Way (BTW), if you haven't experienced higher elevations it is best to go to them gradually if you can.  Two to three thousand feet, then stay a few days, then another two to three thousand feet.  I remember going from sea level to 6,200 feet (Lake Tahoe on the California/Nevada border) by plane once and half our group had altitude issues by the second day including both of us.  A common problem in ski areas is people coming in and collaspsing on the slopes from the altitude change, especially in places like Santa Fe where the skiiing is around 10,000 feet and many of the skiers came from Texas.

-- Edited by bjoyce on Friday 22nd of October 2010 10:01:50 AM

-- Edited by bjoyce on Friday 22nd of October 2010 10:02:18 AM