I am looking to get a new pack system and I am considering the Metcalf. One quesiton I have is what is the interior of the bag like? form what I can find it is pretty minamilistic, which is probably ok but I cant find any info if it at least has a hydration resevoir sleeve? I would think this is standard on any pack now days. Can anyone confirm this, or does anyone have experience with these packs? Not to get into the debate but the other pack I am considering is the new Exo K3 probably in 4800. I currently have a KUIU.