1.21 Crafter-style slot locking, single-block 5-item filtering, and bulk top-off.
Clean, vanilla-native logistics without redstone spaghetti.

Features

20 Items/Second Throughput (Hopper Minecart Parity):
- Built with a 1-tick transfer engine to match hopper minecart transfer speeds.
1.21 Crafter-Style Slot Locking:
- Click any empty slot with an empty hand to seal it. Prevents unwanted items from ever entering or clogging your line.
Filtering:
- Click a locked slot while holding an item to assign a ghost filter. Preserves the item on your cursor.
Single-Block 5-Item Sorter:
- Filter up to 5 distinct items in a single hopper block.
Bulk Pull Top-Off:
- Pulling items into the hopper tops off matching stacks instantly to match hopper minecart speeds.
Full Redstone Parity:
- Full vanilla redstone and comparator support with zero changes or quirks.
Round-Robin:
- Cycles slot-by-slot to keep transfers balanced and vanilla-friendly:
- Transfer speed naturally scales up the more slots you dedicate to an item (up to 20 items/s across all 5 slots).
- Single slots or mixed sorting lines retain a slower, controlled rate.

Interaction Guide & Controls

Action	Interaction	Result
Seal / Disable Slot	Left-Click empty slot with empty hand	Toggles slot lock (renders Crafter red cross grid). Blocks all item intake.
Clear Lock / Filter	Left-Click locked/filtered slot with empty hand	Unlocks slot and clears assigned filter back to standard open slot.
Assign Ghost Filter	Left-Click locked slot while holding an item	Locks slot to that item type (40% ghost overlay). Keeps cursor item intact.
Deposit / Retrieve	Normal Click / Shift-Click with matching item	Transfers items into or out of open/filtered slots exactly like vanilla.

You are completely free to include True Hopper in any modpack on CurseForge and Modrinth.