Thoroughly wash mason jars with hot, soapy water and dry completely - any moisture will compromise storage.
Fill each jar with rice, leaving 1/2 inch headspace at the top for proper sealing.
Place one oxygen absorber on top of the rice if using (recommended for optimal freshness).
Wipe jar rims with clean, dry cloth to ensure no rice particles remain.
Place new lids on jars and secure bands just until finger-tight - do not overtighten.
Attach vacuum sealer to jar using manufacturer's sealing attachment.
Run vacuum sealer until all air is removed and seal is complete.
Test seal by pressing on lid center - it should not flex.
Label jars with contents and date using permanent marker.
Store in cool (below 75°F), dark place away from direct sunlight.