There’s no luggage manufacturer that’ll do quick returns or exchanges. I’m not saying to bring the backup with you. I’m saying if your travel needs are greater than six days to bring a carryon and checked luggage. Depending on who your travel with (airline) you should have status and get free checked luggage for your first 2 checked bags. Have the backups at home. This way you minimize downtime. If you’re saying you don’t have extra space in your home for additional luggage then you’re sol. I keep my spares inside of other luggage (overnight bag inside of carryon and carryon inside of checked bag).