Bundle filters allow you to add extra filtering options to help your customers find what they're looking for - this functionality can be useful for any merchant, but especially for those with a large amount of products for their customers to choose from.
To add filters to your bundle pages, you will first need to assign your products with tags:
In your Shopify Admin dashboard, go to Products > All products.
Select the product you wish to add tags to.
Scroll down to Organization on the right-hand sidebar.
Under TAGS, enter the keywords you would like to add as product tags.
To display these tags in a drop-down filter on your bundle page, you will need to enable product filtering within the app:
Go to Bundles, and select the bundle you wish to edit.
Go to Design, and scroll down to Product grid.
Select Enable product filtering.