The Max Pack greatly increases the range of the Rivian R1S, but it hasn’t been the most popular option on offer from Rivian. This could come down to cost consideration, as the battery pack by itself is quoted at a retail price of $10,000 directly from Rivian. This is a substantial investment in doubling the range of your EV, so it might just not have the sort of interest necessary to make production a priority endeavor.
The Max Pack certainly does seem to pose a great potential for the Rivian product line, however, and one can hope it is on offer with the more expensive trim packages in the months going forward. Currently, Rivian needs to focus more on fulfilling preorders for their more popular packages before offering other options which haven’t been the primary draw for potential customers.