MTI Adventurewear Fluid Inflatable Belt Pack PFD Life Jacket Perfect for SUP paddling-maximum freedom of movelment from belt pack style type III PFD,-24gr Leland CO2 bayonet cartridge Inflates in seconds after a firm tug on the ripcord tab; vest style PFD which once inflated needs to be pulled over head Built-in window allows visual confirmation of CO2 cylinder connection and readiness Inside pocket for back-up CO2 cylinder Convenient printed fold lines on bladder make refolding and packing a snap