The Pressure Demand SAR with Escape Cylinder (Hip-Pac) offers the same reliable facepieces and second stage regulators as the Cougar and 1997-style Panther SCBAs. It allows the user to comfortably wear the respirator to enter an IDLH environment while breathing from a remote air source. Should the air supply be interrupted, the user can switch to the cylinder for escape. The escape cylinder is available in 5-, 10- and 15-minute durations.