in storage
Kept somewhere until being used or addressed in the future. I have a lot of extra linens in storage if you need them. The holidays are over—it's time to put all of these Christmas decorations in storage. We have a lot of junk in storage that we need to get rid of!
in storage
in a place where things are stored or kept. Mary placed her winter clothes in storage during the summer. John's furniture is in storage while he is in the army.