Shrink. - Minecraft Mods - CurseForge
https://www.curseforge.com/minecraft/mc-mods/shrink_
WebShrink is a small mod that lets you change your player's size. By shrinking, you gain access to places that would normally be off-limits without breaking blocks. The mod introduces a single item called the Personal Shrinking Device. When you shift-right-click this device, your player magically shrinks down to about the size of a quarter of a block.
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