Guardian medical kits have an exclusive Patent Pending design to fit behind armor. These blow out kits are vacuum sealed with a one way purge valve to exhaust additional air maintaining a low profile flat fit. This enables the user to carry a blow out kit without the use of additional bulky pouches that take up real estate on the outside of your kit. They are the same surface size as government issued SM/MD Level III ballistic plates and are approximately 1/2" thick at widest point. All kits are packed in a logical way for injury patterns in order of priority for treatments.