Only drop-bears! https://www.youtube.com/watch?v=EwmoiUrC02g
Yep, possums in particular, but it’s usually sufficient just to leave food inside the tent or in any closed container, as they can’t physically rip it open like bears can.
On bears though, family who have visited US & Canada have commented on household rubbish bins being secured inside “pillboxes” to keep bears away. Would they be covered under this scheme?