Smaller? - Check
Non-pressurized? - Check
Safe to Breathe? - Check
Never Expires? - Check
4x the discharge time? - Check
EDIT: Never having to ask which way you're supposed to carry your Fire Extinguisher or wonder if it was charged correctly......priceless.
What's not to like? I'd...
You might find success in the marine world. Red and Green will be easy to find (think 'Red Right Returning') but amber might be difficult to find.
Here is one I found with a simple "Solar Marine Marker Lights" search...
I may be misunderstanding your post so apologies if I am. However, if you are advocating for the inoculation or administering of drugs to wild animals then I would argue that's as loony bin an idea as neutering feral cats and then releasing them back into the wild (an action that I prefer...