You only have your hotbar and offhand, a total of 10 inventory slots.

Stops beds and respawn anchors from exploding in the end so they can't be used to cheese the ender dragon

An updated and polished version of Battt's datapack to remove the offhand.

Inspired by Old School Runescape's Ultimate Ironman mode, this datapack restricts your inventory and storage options (original version by osplo)