Engineer's Toolbox (Immersive Engineering)

The Engineer's Toolbox is an item added by Immersive Engineering. It is used to store tools and other items.

Right-clicking it will open it. Each slot can only store a specific type of item/block; "Food" can store edibles, "Tools" can store tools, "Wiring" can store Immersive Engineering coils and similar items, and "Anything" can store, as it sounds, any block or item.