Last four are fuzz in a pocket Together, a flash, could be a rocket Or a look in the eye A flash that passes by

Rock solid earth reaching for the clouds.

What I contain often pales in comparison to what my potential entails. I can be anything your young imagination can bring, so don't break me down or recycle me, please?

Filled with water, sand, or grain, I carry loads through sun and rain.

I follow you all day long, but when the night or rain comes, I am gone. I mimic your every move, yet I make no sound. What am I?