One in the same, I believe.
I'm so close to pulling the trigger on that pack. I'm still a bit concerned about weight, but then again it's only about a pound heavier than the ABS, or a pound and a half heavier than the BCA.
Price is hanging me up too. I can get the BCA fully equipped for around $600, but the bag isn't very versatile since you can't remove the airbag for other uses. Even though I'd be spending $400 more for the MR pack, I could still use it for other uses.
Any input to help sway my decision, kill?