My friend bought the cheapest fare and assumed my baggage allowance would cover her

My airline ticket includes a checked bag. My friend’s cheaper fare does not.

She packed as if both tickets included one.

At the hotel, she proposed moving half her belongings into my suitcase and checking it under my name. She sees unused weight as a group resource. I see my baggage allowance attached to a bag for which I will answer questions, receive claim checks, and manage any delay or inspection.

Current airline baggage, weight, pooling, security, customs, liability, and restricted-item rules need direct verification for the exact itinerary. Some carriers or routes may permit pooled allowances under specific conditions; others may not. Even where sharing space is allowed, the traveler checking the bag should know and accept every item inside.

I am willing to carry a sweater or other ordinary item I inspect and knowingly pack. I am not willing to absorb an entire fare difference, surrender the space I kept for the return trip, or discover unfamiliar items during screening.

My friend says the allowance is already paid for and will go to waste. That treats capacity as communal while the responsibility remains individual. If the bag is delayed, damaged, overweight, or questioned, the claim and conversation begin with my name.

Her available options are to pay the current bag fee, reduce what she carries, use a permitted personal-item or carry-on arrangement, ship suitable items under accurate terms, or ask whether the carrier officially allows pooling. None should depend on repacking at the last possible moment.

I also want to decide before reaching the airport. A crowded check-in area is an excellent place for a voluntary favor to become mandatory.

Would you share unused baggage weight with a friend? Does the answer depend on whether you personally inspect the contents, or is keeping each traveler’s luggage separate the cleaner rule?