The Duper Trooper | Minecraft Java Multiplayer 1.12 Dupe Glitch (How To Stack Unstackable Items) (No Commands) TTV EP.8 @TheDuperTrooper | Uploaded August 2020 | Updated October 2024, 1 hour ago.
The title says it all TYSM for 500 subs.
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Note: This only works on servers running spigot and vanilla however on spigot it can not have a plugin preventing this dupe otherwise it will not function.

About The Series:
Throughout The Versions(TTV) will be a series where I go through old Minecraft versions and showcase all the glitches that have been in the game