Possible Clues:

• Container appropriate for chow?
• Request at the end of a meal, maybe
• Container for what you can't eat when dining out
• Maybe boxer carries this facility when full?
• Just like an animal, to grab any spare food here
• Diminutive setter perhaps with special interest in takeaway food
• Container for uneaten restaurant food
• Container for taking away leftovers from a meal
• It wraps scraps
• It's for when one orders too much when eating out