Thanks a lot for your question.
Since we have launched our Upsell Bundles app for Shopify, we've succeeded in this field and continue to receive positive reviews at app webpage. There are many options to configure and use it, so if you have any issues or require setup you can always rely on us.
For example you can combine 3 products in one bundle with 20% discount: a mobile phone, a phone case and headphones. Or you can create a kit from 2 products with 10% discount: a laptop and a laptop bag. You can call it as you wish, for example "Bundle Sales", "Buy the Kit", "Package Deals", etc.