air tight = vacuum sealed
in either dark dry cabinet in the garage < make sure in the summer time it doesn't get too hot there...or freezer as mentioned will be fine
nice keep up the good work...unfortunately after a week of Epi, i had real bad headaches...this stuff is potent my lifts were up and felt super in the gym! currently I took 5 days off and probably start back at a lower dose...
keep posting your progress!