Dd is going on holiday with a friend and her family for 10 days. They have booked the flights and we are sending them the money. They have opted for just the free underseat luggage option for all them. I’m not convinced that all her things for 10 days are going to fit. Would I be unreasonable to offer to pay for upgrade so she gets an extra cabin bag in locker above? Is it doable to pack for 10 days in underseat luggage?