Big fan of the Platypus packs. I was looking for a pack with similar criteria and went with the Duthie 15. It's put up with a lot of abuse. Designed for mountain biking, but tough enough for hunting. Good luck with your search.
I've had one like this for about 11 years. Originally got it for snowboarding. Just a sleeve/suspension for a bladder with a bit of insulation to keep your water cold/thawed. I like the hose setup a lot, but I prefer the zip-top bladders from Hydrapak now.