Minecraft Java 1.21 Mods
Browse 5 free mods for Minecraft Java 1.21 — popular picks include TidyInv, Shulk, shulker2box.
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TidyInv
Smart, fast, server-friendly inventory sorting with 7 modes, vertical sort, locked slots, profiles, chest presets, deposit/restock/dump/take buttons, in-game config GUI, and a public API. Works in your inventory and in any chest, barrel or shulker.
Shulk
Shulker Box QoL Tweaks
shulker2box
transforms brown shulker box to warehouse box
Rattlebox
Look at a chest, barrel, shulker, or ender inventory to preview what’s inside, then search your indexed stash and drop a waypoint on the hit. Live in singleplayer, live on multiplayer when the server runs Rattlebox, or from cache when it doesn’t.

Draft GUI: Alt. storage
Draft GUI: Alt. Storage is an add-on for Draft GUI that removes "Item" labels from storage slots, such as chests, shulkers, barrels, and others.