HidrateSpark PRO (formerly STEEL) bottle: 21 ounces / 620 milliliters
HidrateSpark PRO (formerly STEEL) bottle: 17 ounces / 500 milliliters
HidrateSpark PRO Lite bottle: 24ounces / 710 milliliters
HidrateSpark PRO (formerly STEEL) bottle: 32 ounces / 950 milliliters