Hard seltzer is a $9 billion category. Can this brand help it grow even bigger?

The can

SunnyD Vodka Seltzer, $9.99 for a four-pack

The back story

Maybe the hard-seltzer boom hasn’t quite gone bust.

While many have noted that the category has stumbled a bit since it achieved a cult status a few years ago — remember the “White Claw summer” of 2019? — the fact remains that alcoholic, carbonated drinks are…