The 3M™ SCBAG™ Self-Contained Breathing Apparatus (SCBA) system is unlike any other product in its class. It is stored in a unique carrying bag that opens to form a vest with the SCBA system in place and ready for use. The SCBAG™ has unmatched portability and can be donned in a matter of seconds. Jacket-style harness simpllifies training and donning. New design of intake valve is the change from 4230 to 4630 and 4030 to 4430.