Monarch allow 1 piece of hand luggage no bigger than 56cm x 40cm x 25cm (including wheels and handles) and no heavier than 10 kg. You are also allowed a small duty free bag from the airport.
Monarch also give you the option of 2 pieces of hand luggage as long as the combined size and weight is no more than that specified above.
You must pay for each checked bag individually according to weight. Monarch offer a ‘combining allowance’ option where you can share baggage allowance with your travelling companions.
For more information have a look on Monarch’s website.