We need the ability to bundle items into one package. We don't always know what we are going to offer as a grouped item, but still want to track each item as it comes in. Adding items as they come in saves us time as the auction gets closer. Being able to bundle later allows us to mix and match as items come in, while still making sure each donor gets appropriate credit for their donation.

I hope that by "bundle auction items" you mean bundle items for payment. It would be so great to have 1 transaction when multiple auction items are purchased by the same donor / buyer.