Answer:
We are all around, yet to us you are half blind. Sunlight makes us invisible, and difficult to find.
I tremble at each breath of air, and yet can heaviest burdens bear.
My sides are firmly laced about, Yet nothing is withinΝΎ You'll think my head is strange indeed, Being nothing else but skin.
Feed me and I live, give me drink and I die.
What is full of holes but still holds water
People take me on walks and I run and have fun. What am I?