Three kinds of KF bundle in the "Create a Giveaway" page

I think the older ones have less of the DLC contents, vs the newer ones have the new DLC (thus why some are cheaper and others are more expensive).

Basically it's about the date/time when they bought the bundle.

BTW , i own Killing Floor (with all DLc's) i HAVE re-synced my account, it shows up that i own the game, but i still can enter Killing Floor giveaways ?!

1. Killing Floor bundle (July 2012) - Almost all the DLCs
2. Killing Floor bundle (December 2011) - Some DLCs
3. Killing Floor bundle (October 2012) - Complete bundle