Amazon.com: Extender Band for Compatible with Fitbit Flex/2 Fitbit Alta HR Fitbit Luxe Fitbit Inspire 3 or Garmin Vivosmart 4 Watch Band, Band Extender for Larger Wrist or Ankle Wear (Black) : Electronics
Fitbit Flex review: A most versatile, feature-packed tracker - CNET
Irrational or not, I still want a screenless Fitbit Flex 3