@EventHandler
 public void onClose(InventoryCloseEvent e) {
   if (Variables.enchanting.containsKey(e.getPlayer().getUniqueId()))
     Variables.enchanting.remove(e.getPlayer().getUniqueId());
   if (Variables.backpack.containsKey(e.getPlayer().getUniqueId())) {
     ((Player) e.getPlayer()).playSound(e.getPlayer().getLocation(), Sound.HORSE_ARMOR, 1F, 1F);
     Backpacks.saveBackpack(e.getInventory(), Variables.backpack.get(e.getPlayer().getUniqueId()));
     Variables.backpack.remove(e.getPlayer().getUniqueId());
   }
 }