The ipad is no different then the Iphone. And I keep that in the truck/ pocket/ anywhere that is not a great place for it and it works just fine.
A good story that just happend to me, I lost my Iphone 3gs while I was digging out a car that was stuck in the snow behind my shop. Our snow melted and I found it in the grass behind my shop 3 weeks later. It sat in the snow and mud for 4 weeks. It had water dripping out of it, took it apart and dried it out. And to my amazement it started up and works just like new.
I have since bought a iphone 4 and gave the one I found to my dad. It works perfect and I was able to get all my photos and crap back THANK GOD!