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Sibarist B3 FLAT vs Sibarist OREA (FAST / B3)

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.
Sibarist OREA (FAST / B3)
Fits
Flat basket
Flow
Fast · Manufacturer-stated
Material
Paper · Abaca
Reuse
Single-use
Availability
Specialty only
How it brews
Sibarist's abaca flat-bottom paper for OREA drippers, in narrow and wide cuts and offered in both FAST and B3 grades. It sits in the flat-basket family and interchanges with flat papers of the matching fit. The FAST grade is the high-permeability abaca sheet Sibarist rates as fast-draining — good for an open, clean cup where the grind and pour do the steering — while B3 trades speed for more body and retention (both the maker's own framing, not measured here). Specialty, single-use, with the usual rinse.