cruising with RC 7 days at alaska.
is the ship has Baggage Restrictions same as in flights?
for example, if i buy extra suitcase (altogether 2 suitcases and a carry on baggage) - do i have to pay extra or is it restricted from boarding with it to the cruise?
No baggage restrictions. You can just leave them with a porter and they will show up at your cabin later on the first day. If they are small enough to go through an airport scanner, you can carry them on...but will have to lug them around until your cabin is ready...usually around 1:00.