Official bakugan have the authentic packaging and fake bakugan have the fake packaging.That's it!(And of course fake bakugan is more than the real bakugan in some stores...But real bakugan is more than fake bakugan in the retailer shop and other big stores(i.e toyrus))
GI bakugan is from the store where I got most bakugan from. They have a lot of new bakugan but without package. They received them just like how Baku813 get his. A big big plastic bag.