Box loader

Box loaders are a common storage tech contraption that takes in items and "loads" them into a shulker box using hoppers or droppers. They can be used to compact items into smaller spaces and make handling items easier for both the player and storage systems.

Fundamental Mechanics:

It is useful (and often required) when designing loaders to know how filters work. Please see this page for an in-depth explanation of item filters. Second, you need to know how shulker boxes are automatically placed and broken in the world. This page explains that.