In our Bundler app, you can create a bundle quite easily and fast. We also have a lot of different options which allow you to create more advanced bundles. 
Here are steps for creating a simple bundle:

• Go to your Shopify store admin.
• Navigate to apps.
• Click on Bundler - Product Bundles.
  
• Click on Create bundle button.  
• Scroll down and set the desired discount. It can be a percentage or a fixed amount discount. 
  
• Scroll even lower and click on the Select products button to select products. 
  
• Select products and confirm your selection. 
  
• Scroll back to the top of the page and click Save button. 
  
• Go to the product page of one of the products in the bundle and check if a bundle widget is displayed there :)

That's it!