Yep, if I ever get a bottle rocket that can fly 7500 feet up, just before I light it I'm gonna say:
"Hold my beer and watch this!"
It must be one of those rockets like the ones used in "Category 7: The End of the World" where they shot them off standing four feet away. Those, according to the film, could easily reach 7500 feet... and they were only about two feet long!
Seriously, it is crap like that film that make the gullible public accept the premise that a bottle rocket or flare could reach 7500 feet.