A hydrapak 70 oz. fits perfectly in the top reservoir sleeve.
Actually I wanted to know what if you had both the Marmot Pinnacle and the Marmot Lithium which would be the better choice to keep?
I am wondering. There doesn't seem to be that great of a difference between the Pinnacle and the Lithium other than the type of down fill. According to the temp ratings there seems to be about 4 degrees of separation. Are they very similar in performance or does the Pinnacle do better with warmer temps. Or are they about the same?