Please first make sure that you are logged in on your iPad with the same Apple ID you used for purchase. You can use Restore all paid downloads button in the Login section (if you are logged in there must be your name/e-mail) -> Packs tab.
After pressing the button and entering your Apple ID details, all of the purchased packs will be added to your Packs section. You can restore the packs you would like using the Restore button on each pack.
You can also repurchase the Ultra Pack or All Inclusive, the Gold Deal, and the Unlimited Energy for FREE. You won't be charged twice for the same purchases as long as you use the same Apple ID.