The FB30 is designed to hold any modern-style SCBA face piece with MMR (mask-mounted regulator), models NFPA 1997 or newer. The bag will hold a face piece with the regulator attached as well as most voice amp and comms devices. The FB30 will also hold an airline face piece or mask with APR (air-purifying respirator) cartridges attached, with the exception of larger CBRN?canis