I dont have one, but i have tried on the Camelback hunting packs and I really like them. They have a couple of different sizes for different applications and durations of the hunt. They are also not rediculously expensive and having the built in hydration system is a huge plus. I do have one of their non-camo midsized packs (i used to use it for mountain biking) which I use for scouting when being hidden is not as important. I tis esentially the same as the hunting packs. The only concern I have is that it is sometimes hard to get on with lots of bulky layers. Other than that i would defiently check the Camelback hunting packs out. Hope this helps.