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The iPad 2 is an expensive piece of gear and occasional drops are expected if you carry it around with you. Thankfully, the case was tested to withstand a drop of 6 feet to a concrete floor. I wasn't willing to test my $829 iPad 2 by dropping it myself, but feel free to do so yourself :)
There are sealed ports in the case and the sand/dust test conditions were 3 hours at up to 59 feet/second. I appreciate this protection since there are times when dirt is blowing around where I work.
If you are blowing through the woods on an ATV then you are likely subjecting your iPad to some heavy vibration. This test was conducted over 18 hours at 20-2000 Hz and the silicone piece helps absorb these vibrations.