Baggage allowances can vary by airline and destination. Here is a guide to standard allowances (to confirm allowances for your flight booked, please refer to your ticket or contact the airline you are flying with).
Cabin baggage: The following items CANNOT be carried in your hand baggage: Toy or replica guns (plastic or metal) Catapults. If there is a medical reason that passengers need to inject themselves during the flight (e.g. diabetics) they are permitted to carry syringes in the cabin. They may be asked to produce medical evidence when they check in or at the security screenings (a doctor’s letter will suffice). This should be kept with them at all times.
Checked in baggage allowance: This depends on the airline you are flying with as each airline now has its own baggage rules and specifications. This information will be stated on your itinerary.