When you or we estimate the volume, it may still differ from the actual volume. Small differences are common. It may also be the case that you eventually decide to take more or less with you. Transpack will give you an offer based on the estimate, but this is not binding. Any difference will always be corrected in the invoice. If it is more than the estimate, an additional invoice will follow. If it is less, you will receive the overpaid amount refunded to your account.