MYBOX.zip is a release file of the Minecraft resource pack default+ Biomes O' Plenty addon, made for Minecraft 1.16.3, 1.16.1, 1.16, 1.16.5, 1.16.4, 1.16.2. It was published on December 22, 2021 and is 0.8 MB in size. For the full description, screenshots and every other version, visit the default+ Biomes O' Plenty addon resource pack page.
How to install: Put the .zip into .minecraft/resourcepacks (do not extract it) and enable it under Options → Resource Packs.
