Hello Aternos Team!
Will you please consider adding BackSlot mod?
Link to the mod: https://www.curseforge.com/minecraft/mc-mods/backslot
BackSlot mod grants us an additional slot designed for any weapon and tool except: flint and steel, fishing rod, shears, trident, shield and elytra.
It also gives us a new cosmetic change on the back, if the player has no chestplate put on himself. Moreover, this mod is compatible with Netherite Plus and Enderite mod.