The vapor and gas collection bladders are used to produce a predictable gas flow to either a combustion or recovery unit. Primarily used in gasoline distribution terminals, these holders are instrumental in providing a reliable, consistent flow of gas vapors to burners/recovery units. Vapor holders allow terminals to use a smaller burner/recovery unit by providing the capacity to store gases during peak operating times. Vapor bladders and gas collection systems are commonly used in waste water treatment facilities to collect Methane vapors. These vapors are used to power an engine that assists in producing energy for the plant.