This very extensive and strong bag is ideal.  There are 3 separate compartments for Lowermast - Topmast - Boom.
 
Bag has an extra lining and heat resistance inside for optimal protection for your Carbon masts.
 
Three tying loops are made at the top so you can tie the whole set together with rolled sails for transport.
 
In short, strong but a well thought out complete genuine Nautivela mast bag.