Do you feel this is safe?

[Starfish]

7.2 oz in a jersey pocket? Wouldn't fit in mine! My 3.3 oz phone is a lot.

And wouldn't you have to put it in a ziploc bag... kind of defeating the purpose?

This thing is small. It fits. And, even if you did want to put it inside something, the couple of seconds it would take to free it would be a lot shorter than the 20 minutes or half hour, depending on where you are, for a sheriff to show up after a cell phone call (and that can be an optimistic response time in some areas where I ride, which I know from experience).