If your flightbag has a strap then put the strap around the backseat of the seat so your bag is restrained and you can always reach it.
Carry a $20 extinguisher if it makes you feel better. I felt better.
Then worse when it discharged in my flight bag in my car as I tried to save a discount large pizza box from falling on the floor and I elbowed my flight bag.
And yes, you’ll taste it for three days.