The bundles allow you to buy them all at once, rather than clicking individual. Bundle 1 was limited I believe to the what was available at the time, and bundle 2 was buying the items available and the onces that weren't released yet.
Either way works, the true goal for the items was the donations during this month, I believe it was either 70% or 75% of the money is going towards the Japan Relief funds.
that's a nice thing to do... i work for a japanese company and all of the japanese in our company went home to Japan to help there and be with their families... it was really devastating for them...