Yes, I clearly linked containers that aren't the device in question. I don't see the need for the extended battery case in those use-cases.

I also don't see my cat wearing that thing either. Maybe a large dog.

But things like wallets, remotes, cats, dogs, are usually in your possession frequently and only lost for short periods of time before you notice.

Luggage would be a good use case, and possibly bikes and other large equipment. But I would opt for something more discreet vs a larger battery.