Nor did I, until I got one. Wouldn't be without now. Hydration bladder included, or at minimum hydration bladder compatible, is a requirement for any pack I purchase from now on. This coming from a person who used to say "Why would I waste my money on such a thing when I've already got perfectly good water bottles?" For long hikes that may exceed my hydration bladder capacity I take full Nalgene bottles as a backup.