Container
Magento\Ups\Model\Config\Source\Container
What it does
This class provides a configuration source for UPS shipping container types in the Magento admin panel.
Developers use this class when they need to populate dropdown or select fields with available UPS container descriptions (like boxes, envelopes, tubes) for shipping configuration options.
It extends the Generic source class and specifies 'container_description' as the data code to retrieve from UPS carrier configuration.