STACK IT! 1.21.100+ [v1.5]

STACK IT is a behavior pack that makes some items stackable, like the beds, which can now stack in 16 items together.

Items

• All types of boats now stack to (16)

• All types of potions and beds now stack to (16)

• Eggs and ender pearls now stack to (64) instead of 16 (added the new brown and blue eggs with the version 1.5)
• All types of enchanted books now stack to (8)
• Saddles now stack to (2)

• All types of minecarts now stack to (16) instead of 1

Updated on January 27, 2026

• Updated to v1.5 (1.21.100+)
• All types of banners now stack to 32 (instead of 16) — including custom banners
• All types of banner patterns now stack to 8 (instead of 1)
• Book and quilt now stack to 8 (instead of 1)
• All types of soup and stew now stack to 16 (instead of 1)
• Honey bottles now stack to 64 (instead of 16)
• Added known bugs & workarounds — read the "Known bugs" section below before downloading

Known bugs (IMPORTANT — READ BEFORE USE)

This behavior pack is not very stable and has a lot of bugs since Minecraft / Mojang does NOT officially support custom stack sizes for some items. It can be done but may produce many issues.

The bugs

1. Throwable items such as eggs (all types) and ender pearls: these can't be stacked directly from the Creative menu. You need to manually drop and pick up 4 stacks of 16 to get full 64 stacks. They also cannot be moved inside your inventory normally — you may need to drop them, fill up inventory slots, then pick them up. When moved to chests you may need to use shift+left-click (or double tap on mobile) and they might revert to their original stack value (16).
2. Banner patterns: if you use more than one pattern inside the loom they may not be removable (looks like an infinite-glitch). A version without banner pattern stacking is available if you prefer.
3. Book and quilt: when stacked, typing in one book may replicate across all stacked books — useful for saving time but can be annoying if unexpected.
4. Enchanted books: stacked enchanted books may not be usable directly in an anvil; they often must be separated manually to apply them.

Everything else is generally fine to use, but please test in a safe world before applying to important saves.

Table of Contents

• Items
• Known bugs (IMPORTANT — READ BEFORE USE)