What's a good solution for safely storing 3.5" backup hard drives that are regularly retrieved and put back in a safe off-site location? I have a few bare 3.5" hard drives which are inserted into an OWC USB-3 drive dock (which works really well!) whenever I need to make an off-site backup and I'm thinking some sort of padded anti-static box specifically for this purpose. Suggestions anyone?
(photo source: NotebookCheck.net)

(photo source: NotebookCheck.net)