US passenger beware!
They have become a nightmare for the US traveler. We provided a deposit and carried the luggage when 7 business days payment timeline was provided. After 7 business days, they, again and again, told me money will be provided the next business day. The same "tomorrow" or "early next week" repeated again and again. In the meantime, we missed a credit card payment which resulted in a late fee. It took them 30 days to get the luggage and pay me back. If you are okay with sitting your money somewhere for more than a month then Backpack is okay. Otherwise, don't carry the luggage, if you do - your vacation will be ruined.