A portable gas cylinder comprising: a gas tank having an upper portion having a valve port ; and a handle assembly attached to the gas tank , the handle assembly having a shroud and a handle attached to the shroud ; wherein: the gas tank has a collar surrounding the valve port , the collar having a plurality of circumferentially spaced openings ; the shroud of the handle assembly has a plurality of circumferentially spaced body portions , a first plurality of circumferentially spaced deflectable fingers extending downward in a first direction that are each engaged with a respective one of the plurality of circumferentially spaced openings in the collar to attach the shroud to the collar , and a second plurality of circumferentially spaced deflectable fingers extending upward in a second direction; the handle of the handle assembly has a body that surrounds and abuts the shroud , and a plurality of circumferentially spaced openings extending through the body ; wherein the second plurality of circumferentially spaced deflectable fingers are engaged with a respective one of the plurality of circumferentially spaced openings in the handle . a gas tank having an upper portion having a valve port ; and a handle assembly attached to the gas tank , the handle assembly having a shroud and a handle attached to the shroud ; wherein: the gas tank has a collar surrounding the valve port , the collar having a plurality of circumferentially spaced openings ; the shroud of the handle assembly has a plurality of circumferentially spaced body portions , a first plurality of circumferentially spaced deflectable fingers extending downward in a first direction that are each engaged with a respective one of the plurality of circumferentially spaced openings in the collar to attach the shroud to the collar , and a second plurality of circumferentially spaced deflectable fingers extending upward in a second direction; the handle of the handle assembly has a body that surrounds and abuts the shroud , and a plurality of circumferentially spaced openings extending through the body ; wherein the second plurality of circumferentially spaced deflectable fingers are engaged with a respective one of the plurality of circumferentially spaced openings in the handle . the gas tank has a collar surrounding the valve port , the collar having a plurality of circumferentially spaced openings ; the shroud of the handle assembly has a plurality of circumferentially spaced body portions , a first plurality of circumferentially spaced deflectable fingers extending downward in a first direction that are each engaged with a respective one of the plurality of circumferentially spaced openings in the collar to attach the shroud to the collar , and a second plurality of circumferentially spaced deflectable fingers extending upward in a second direction; the handle of the handle assembly has a body that surrounds and abuts the shroud , and a plurality of circumferentially spaced openings extending through the body ; wherein the second plurality of circumferentially spaced deflectable fingers are engaged with a respective one of the plurality of circumferentially spaced openings in the handle . <EOS>