Low affinity, high-flux Na(+)-dependent bicarbonate transporter (PubMed:31712753). Involved in carbone dioxide-concentrating mechanisms (CCMs) that accumulate CO(2) and improve photosynthetic carbon fixation (PubMed:31712753). Forms homodimers through the STAS cytoplasmic domain. Belongs to the SLC26A/SulP transporter (TC 2.A.53) family.