Rebolt Bundle & Upsell

If you need this to work with multi-currency, don't waste your time. It does not work with multi-currency. Probably a support person error, but they told me it definitely works with Shopify Multi-Currency and I spent quite some time getting it to thematically match our site and to work well, only to switch currency and find it doesn't switch lol.

For a good bundle system that can do multi-currency and multilingual (with many other things like upsell and cross sell) check out Selly in the Shopify app store.

This app will work fine if you don't need multi currency