PlayerInteract

public class PlayerInteract implements Listener {

    @EventHandler
    public void playerInteract(PlayerInteractEvent event) {

        if (event.getAction() == Action.RIGHT_CLICK_AIR || event.getAction() == Action.RIGHT_CLICK_BLOCK) {

            ItemStack item = event.getItem();

            if(item == null) return;
            if (item.getType() == Material.PHANTOM_MEMBRANE) {

                Player player = event.getPlayer();

                ItemMeta data = item.getItemMeta();

                if (!data.getPersistentDataContainer().has(new NamespacedKey(Backpack.getPlugin(), "backpack_id"), PersistentDataType.STRING)) {
                    data.getPersistentDataContainer().set(new NamespacedKey(Backpack.getPlugin(), "backpack_id"), PersistentDataType.STRING, "");
                    item.setItemMeta(data);

                } else {
                    HashMap<Integer, ItemStack> backpackContents = BackpackUtils.getContents(item);


                    Inventory backpack = Bukkit.createInventory(player, InventoryType.DISPENSER, Component.text("Backpack"));

                    backpackContents
                            .forEach(backpack::setItem);
                    player.openInventory(backpack);

                }
            }

        }
    }
}