Keith here, I’m a part of the Guru Team at Shopify! :)
There are many apps that can create bundles for your customers and offer a discounted price rate as well. Two favourites that come to mind are Product Bundles by Bold and Ultimate Special Offers by Supple . Using either of these will allow you to create tiered pricing where your customer's will recieve discounts at the cart for adding X number of products. They both offer some visual prompts that you can set up to get your customers to opt into the packages. Bold offers a video demo of how the system works while Supple has a test store that you can test out the functions. These can be tailored to suit your individual needs.
If you have any questions on how to set up these apps you are more than welcome to contact our support team for guidance!