Bundles.app ‑ Inventory Sync
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My first choice app for creating bundles. I tried several but this was the most straight forward and useful for it.
My only constructive criticism is that you have to set up each variable in the bundle one-by-one, which is quite time consuming. There is also a limit of variables that can be used so if there are too many color or size combinations the particular bundle might not be possible.
Nice app that allows you to easily create simply bundles of products. Great support service if you have any questions to.