I do alot of hiking and am looking for a good sturdy dog backpack for Max. anybody have any recommendations? all the ones I have seen in petsmart and petco look a little flimsy for my purposes, was looking for something big enough for him to carry his own water, spare leash, maybe some odds and ends i cant fit in my pack on a day hike, etc. something with its own hydration bladder would be awesome, I try to stay away from plastic bottles when I can. I'd say he is about average sized, around 80 lbs or so. Its about time he starts lugging his own crap around....