Answer:
I’m a word, six letters long; I sometimes enter with a gong. All in order from A to Z, I start with the letter B. What is the word?
My sides are firmly laced about, Yet nothing is within; You'll think my head is strange indeed, Being nothing else but skin.
What stays the same size no matter how much they weight?
What is lengthened by being cut at both ends?
Searing 'cross the pitch-black skies, I scream in celebration, Yet moments later, my outburst through, I am naught but imagination.
They are many and one, they wave and they drum, Used to cover a state, they go with you everywhere.