There is no baggage restrictions onboard Explorations by Norwegian, however stateroom space may be limited, and your luggage will need to be stored under your bed or in the closet. Keep in mind that your airline may have separate baggage limits, which will vary on the carrier, class of travel and flight routing.
If your Explorations by Norwegian package includes a pre or post-cruise tour, there is a touring luggage limit based on coach capacity. Passengers are limited to one checked luggage item weighing no more than 20kg, along with hand luggage that can be stored with you on the coach whilst traveller. You will need to be able to transport your own luggage between hotels, transport, etc.