Continental Airline Tickets - could i use a box as a check in luggage in an intl flight to the Philippines?

could i use a box as a check in luggage in an intl flight to the Philippines?

what are the dimensions if ever if i am allowed to check in a box? is this allowed in northwest airlines?

You can check anything in. Box, bag, animals, golf clubs. You can call the reservation line and ask them. If I remember it 30 in. in any direction. You can check bigger boxes but there will be a charge.