Mantic Games is offering free messenger bags with select orders.
From their announcement:
Mantic Games has put their Small and Large Carry Cases up onto their website to purchase individually, as well as in bundle deals
In combination, as the video shows, there are few better ways than the Mantic Messenger bag to transport your army around in, – and now you can have one absolutely free!
We\re giving a free messenger bag away up until the end of the 31st May, if your order is over the threshold as you complete payment, then a Messenger bag will be automatically added to your order when dispatched.