Infinite Product Options

I use this app for many things: gift wrapping option, bundle products, special notes/tags on special products. Don't let the simple user interface fool you--this is a very sophisticated system. Before using for my bundles, I literally checked every bundle app out there. By far, this is the best one out there. It let's me configure very easily and also allows for discount codes to be applied. Also: the customer support is extremely responsive and helpful. In addition to actual thoughtful explanations to my inquiries (vs. template responses), they troubleshoot by fixing my liquid files directly. I have multiple shopify stores and use dozens of apps for each--this is my favorite.