I am a Midwestern adventure racer that has been racing for going on 8 years now. I started out using Camelbak packs, but found them to be unsuitable for adventure racing. My teammates had OutThere MS-1 packs and I finally got around to buying one and fell in love with it. It lasted 6 years of hard training and a lot of racing. I recently replaced it with a MS-2 and already love it that much more. You can find my blog about the whole story at http://teamboradventureracing.blogspot.com/2017/12/adventure-racing-and-out-there-packs.html. If you are planning on adventure racing you need to start here.