public ItemInventory(ItemStack backpack)
    {
        this.slots = stack.getItemDamage() +2;
        this.stack = stack;
        this.modules = new ItemStack[slots];

        if(!this.stack.hasTagCompound())
        {
            System.out.println("Generating new NBTTagCompound for stack item");
            NBTTagCompound nbt = new NBTTagCompound();
            nbt.setBoolean("createdtag", true);

            System.out.println("Generated Tag " + nbt.toString());

            this.stack.setTagCompound(nbt );
            System.out.println("Has nbt? " + stack.hasTagCompound());
        }
        else readFromNBT(this.stack.getTagCompound());
    }