But packaging with logo like McDonald's should be protected by copyright and trademark.
It is difficult to protect patents by dividing large packages into small packages. China does not protect business method patents, but the United States does. If it will really have a great impact on production and sales, it is recommended to apply for a patent for American business methods after registering a company in the United States.
If your packaging is different from the existing packaging form, such as static packaging, you can apply for a patent by inventing a dynamic packaging bag or improving the existing foldable packaging, but you can't apply for a patent if you just change the large packaging into a small packaging.