Bear spray disposal ?

I've heard of one fellow who just sets it off in the trunk of his vehicle.

In a more serious note, Counter Assault has this to say on their website:

How do I properly dispose of expired or used bear spray?

Bear spray is considered hazardous waste and cannot be put into your regular garbage. We recommend contacting your local waste management company or recycling center as they have a process to safely dispose of bear spray. If you are in the Greater Yellowstone or Glacier National Park areas, there are recycling programs with designated drop-off points so the canister can be recycled.

counterassault.com/blogs/resources/what-you-need-to-know-about-bear-spray#:~:text=There%20is%20an%20expiration%20year,

missoulacounty.sharepoint.com/Hlth/EnvHlth/WQD/EI/Forms/AllItems.aspx?id=%2FHlth%2FEnvHlth%2FWQD%2FEI%2FHousehold%20Hazardous%20Waste%2FYear%20Round%20Disposal%2FYear%20Round%20Disposal%20Guide%2Epdf&parent=%2FHlth%2FEnvHlth%2FWQD%2FEI%2FHousehold%20Hazardous%20Waste%2FYear%20Round%20Disposal&p=true&ga=1

Not sure if you live near there.

Probably going to vary a lot from locale to locale. I believe you have to find something local because I don't think you can ship them.

Where I live we have a Household Material Recovery Facility (H-MRF). They take anything you can't throw out no charge to residents of southern Westchester.

You might want to find out if it is legal to empty the can then punch holes in it then throw it in recycling. That's how I throw out fuel cans. Definitely wear protection when punching the holes. Maybe shoot it from a distance then go pick it up in a few weeks.

Maybe ask a Yellowstone Ranger?
Surely they have to dispose of canisters occasionally.