To pledge for multiple rewards, simply add the totals together for all rewards you would like to participate in, increase your pledge to cover all rewards you wish to back. When the project ends, you will be sent a survey, simply list the reward levels and quantity you pledged for.
Multiple Rewards backers can receive a pledge softener off their second (and each subsequent) product of choice. Take $5 off the Ungabunga or Dundabunga pledges, and $10 off for Sungabunga or Treebunga. This does not apply to the early bird rewards as they are already heavily softened. Multiple rewards International backers can also take off $10 shipping for any reward after the first. Shipping for US backers is included.