The Inflation Dry Sack is compatible with the Light Mattress, Flex™ Mattress, and Base Mattress valves. Note that the Light and Flex™ Mattresses come with an Inflation Dry Sack. Only purchase one if you are looking for a replacement or want one for your Base Mattress.
The Inflation Dry Sack is compatible with the Flex™ 3D Mattress valve but those mattresses come with a different style of inflation storage sack. No need to purchase one for your Flex™ 3D.
The Inflation Dry Sack is not compatible with the Ultralight Mattress or Flex™ Air Mattress valves.