Common Sense Evaluation

He who has it doesn’t tell about it. He who takes it doesn’t know about it. He who knows what it is doesn’t want it.

What is it?

 

 

I can sizzle like bacon,
I am made with an egg,
I have plenty of backbone, but lack a good leg,
I peel layers like onions, but still remain whole,
I can be long, like a flagpole, yet fit in a hole,

What am I?

 

 

What object has keys that open no locks, space but no room, and you can enter but not go in?