Wondering the same thing. I'm hoping someone can get one in their hand and verify the listed weights on their website.
If I'm understanding this correctly the Gnargali weighs 2lbs 12.48 oz.
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The Muskeg 5000 weighs 2lbs 8.8 oz.
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I understand the Gnargali has ~600ci more but it weighs more than the Muskeg and the Muskeg has a zipper lengthwise. I have grown very attached to the zipper on my hoodlum because it make it easy to quickly retrieve things that have migrated to the bottom of the pack.
I am looking for a lighter pack to replace my wife's 44 Mag which also serves as a backup pack for myself. It looks like I'm splitting hairs at this point between the packs. Looking forward to more feedback from the new pack owners before I make a decision.
Edit: I also just realized/remembered the Gnargali eliminates the need to use a gun bearer. That would make the Muskeg 5000 + gun bearer weigh the exact same as the gnargali. So it pretty much boils down to the preference of having a zipper on the Muskeg or having 600ci more space on the Gnargali.