Re-arm the NRS Matik or Zephyr Inflatable PFDs with the 24g CO2 Re-Arming Kit. For extended trips, be sure to have a spare kit and prepare for the unexpected FEATURES: Includes one 24 gram replacement CO2 cartridge and arming indicator tab Flying with your Inflatable PFD? According to the Transportation Safety Administration's (TSA) website: "You may bring a life vest with up to two CO2 cartridges inside, plus two spare cartridges in your carry-on or checked bag." Be aware that individual TSA agents may not have read that particular regulation