Not sure how one would pursue happiness. Seems like a fruitless endeavour; better to close your eyes, flail around and hope for the best.

Happiness is all manner of things for me: Helping friends and family. Socialising with friends and family. Laughing at all the absurd things that happen to the people I know. Drugs, whether it's alcohol, weed, mushrooms or LSD. Even painful events bring me happiness to some extent. Strangely enough most of my happiness stems from the absurdity of my life and it's happenings, I always have a good laugh thinking about all the things that make no sense.

Can it be kept? Stored if you will? No, of course not. To quote Gogol:
But nothing is lasting in this world. Even joy begins to fade after only a minute. Two minutes later, and it is weaker still, until it is swallowed up in our everyday, prosaic state of mind, just as a ripple made by a pebble gradually merges with the smooth surface of the water.
Is happiness achievable? Yes in brief segments, sure. But, it is silly to think there is some way to transcend this existence into something more meaningful. And holding hope that there is is frivolous.

But maybe I've read too much Camus.