Unfortunately when I ride my 400ex I usually do it by myself because most of my friends don't have quads. So when I ride I carry my iPhone (3GS 32gb) with me. My riding pants have pockets and sometimes at the end of a long day of riding I would pull my phone out and it would have sweat on it. This case has been great! I've used it a few times with absolutely no problems. It's a little taller than I need for my phone but it fits in my pocket perfectly. I was very happy to see that I could even dial the phone, etc through the case without having to take the case off. So no worries about getting your iPhone muddy, just dial/text/e-mail with the dry pack case on!