Answer:
My first half means container. Not a lot of people understand my language. What am I?
Marking mortal privation when firmly in place. An enduring summation inscribed in my face.
Lighter than feather and softer than silk, yet the strongest man in the world cannot hold me for more than a few minutes. What am I?
Born in the ocean and white as snow. When I fall back to water I disappear without a trace.
I am the kind of a tree that is carried in your hand. What am I?
I tell people to be careful when handling boxes.