Welcome.  
big MR fan here and the beartooth is a hell of a bag.  I like mine a lot but I will say, I rarely fill it up for anything less than 3-4 days.   I own a pintler as well and use that for shorter trips.   If I only had one MR pack it would be the Metcalf or maybe a terraplane.   You can strap the beartooth down pretty well when it is not full but it is definitely a large pack.  
I like and use their backpack lid for side excursions.   I think they come with the beartooth now.   The one with shoulder straps.   another decent accessory is a bag of some sort to contain items on the meat shelf.   I use an MR dry pack.  Loose items can shift or fall out so I like to have something to give them containment.