What Am I Riddles

Question: What is it that no man wants, but no man wants to lose?

Question: Weight in my stomach,trees on my back,nails in my ribs,it's feet I lack.What am I?

Question: What has to be broken before you can use it?

Question: I'm tall when I'm young and I'm short when I'm old.What am I?

Question: You put me in hard.
But then I become soft.
Blow me hard and I will get bigger.

What am I?