GrandPack.zip is a release file of the Minecraft resource pack GrandPack, made for Minecraft 1.8.9. It was published on May 31, 2021 and is 19 MB in size. For the full description, screenshots and every other version, visit the GrandPack resource pack page.
How to install: Put the .zip into .minecraft/resourcepacks (do not extract it) and enable it under Options → Resource Packs.
