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In this study, we present a jacketed breathable flask system that enables real\u2010time gas control in a standard shaking environment. Across multiple media formulations and fill volumes, this system consistently deferred oxygen limitation and enhanced culture performance, achieving &gt;\u2009150% higher biomass and 140% greater recombinant protein yield compared to conventional flasks. Time\u2010resolved analysis of pH and extracellular metabolites revealed reduced accumulation of oxygen\u2010sensitive byproducts, including acetate, pyruvate, and succinate, indicating a shift toward more efficient respiratory metabolism. The jacketed breathable flask also enabled continuous monitoring and regulation of critical process parameters, creating a bioreactor\u2010like environment in a high\u2010throughput, low\u2010cost format. The biomass accumulation and specific growth rate observed in jacketed breathable flask are comparable to those reported for\n                    <jats:italic>Escherichia coli<\/jats:italic>\n                    cultures in stirred tank bioreactor application notes for Eppendorf BioBLU 3f. These findings establish breathable flasks as a scalable and accessible platform with bioreactor\u2010like performance for upstream process optimization and accelerate biomanufacturing development at the lab scale.\n                  <\/jats:p>","DOI":"10.1002\/bit.70157","type":"journal-article","created":{"date-parts":[[2026,1,10]],"date-time":"2026-01-10T06:45:51Z","timestamp":1768027551000},"page":"1064-1076","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Development of a Jacketed Breathable Shake Flask With Process Monitoring, Control, and Bioreactor\u2010Like Performance"],"prefix":"10.1002","volume":"123","author":[{"given":"Vikash","family":"Kumar","sequence":"first","affiliation":[{"name":"Center for Advanced Sensor Technology University of Maryland Baltimore County Baltimore Maryland USA"},{"name":"Department of Chemical, Biochemical and Environmental Engineering University of Maryland Baltimore County 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