Washington's Favorite tree but somewhat obscure by history

In case you noticed, I had a three day hiatus. Telling mods who spam the world to stop, is against the rules. In response to giving them facts, they did this to me for three days.

Beaches have me, and my solid form travels with packages. I emerge when dirty dishes are done. What am I?

People love to walk on me, but hate it when I'm in their shoes. Shiny, tiny jewels 'neath the sea, but I cannot pay your dues.

Metal jacket, small and round, I keep what's inside safe and sound. A friend to beans, a holder of fizz, Open me up to see what it is.