This model has been our best seller because a person is most vulnerable to attack when getting in or out of their car. With the spray attached to your key ring you'll be able to quickly defend your self without having to waste time looking through your purse or pocket. The pepper spray cannister measures in at 3 and three-sixteenth inches x five-eights inches x five-eights inches.  The included holster measures in at  5 inches x   1 and one-quarter inches x 1 inch (including the key ring).