What does in our jack?

"In our jack" is not a common phrase. It's likely a mishearing or a typo.

Could you please clarify what you meant to say? Perhaps you meant:

* "In our jacket": This would refer to something being inside a jacket.

* "In our backpack": This would refer to something being inside a backpack.

* "In our car": This would refer to something being inside a car.

Please provide more context so I can help you better!