Halachos of Storing Chometz on Pesach:
Reprinted from Rabbi Felder of SSCM
It is forbidden to have chometz (even if it was sold to the goy) in a place
where one may come to eat the chometz. Therefore, a Mechitza of 10 Tefachim
(30 inches or 40 inches) should be placed in front of the chometz.
Chometzdike dishes and cutlery as well must be locked away for Pesach.
If the chometz is in a closet or cabinet one must lock the door or tape it
shut so that one can’t open it easily by pulling the door.
Placing the chometz in a closed bag in the refrigerator or in a cupboard
even on its own shelf does not suffice.