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Fellow Aiden Batch Flat Bottom vs Sibarist B3 FLAT

Fellow Aiden Batch Flat Bottom
Fits
Flat basket
Flow
Unknown · Unknown
Material
Paper · Cellulose
Reuse
Single-use
Availability
In production
How it brews
The flat-bottom batch paper for Fellow's Aiden, sized for 8-12 cup brews in the flat-basket family. The wide, flat bed is the batch-brew geometry; it fits flat-basket seats and interchanges with other basket papers of that fit, not with the Aiden's single-serve cone. Fellow publishes no flow class, so we leave flow unrated. It's an everyday single-use paper with no special care beyond seating it flat.
Sibarist B3 FLAT
Fits
Flat basket
Flow
Medium · Manufacturer-stated
Material
Paper
Reuse
Single-use
Availability
Specialty only
How it brews
The B3 grade of Sibarist's abaca flat-bottom paper (associated with Matt Winton's flat-bed method), in S and M. Unlike the FAST papers, B3 is a lower-porosity sheet Sibarist rates as medium flow, trading some drainage speed for more body and retention across the flat bed. That medium class is the maker's own framing, not independently measured. It fits the flat-basket seat and interchanges with other flat papers of that fit; a pre-brew rinse is common.