I used one of the international flat rate boxes. It was $37.00 to mail to Spain- its considered priority shipping and will be there in 6 - 10 days. The largest box the post office has for international flat rate shipping goes for $49.00 and has a 20 lb weight limit. Picked up one of those today to put stuff in for another shipment. The post mistress made me take the curled party ribbon off the front... geeshhh..... :):):):)