gift sack

The scrotum forms an admirable covering for the protection of the testes. These bodies, lying suspended and loose in the cavity of the scrotum … are capable of great mobility, and can therefore easily slip about within the scrotum, and thus avoid injuries from blows or squeezes.

"I've got a couple things for you in my gift sack."

"Here's 0-2 pitch to A-rod. Oh! And he's taken it right in the gift sack!"