Where does Santa hide stuff untill the big day?

no need to hide it here
i have always explained to our kids that Christmas is a time to celebrate the birth of our Lord and Saviour Jesus Christ and even though we celebrate it by giving gifts to our children, they know these gifts are purchased by us, the parents

(my oldest is 6, youngest is 3)

now, i do need to hide some gifts for the missus, but they are usually not too terribly big