You might as well compare with these Back Items so you can decide which Back Items you're gonna use for ninja Saga Pvp or in Hunting House for easier killing the boss or your opponent in ninja saga PvP
These Back Items might have better effect . Here we go :

• Businessman Luggage
• S61 God Dragon Flag

  Increase critical rate by 6%. Has 20% chance to apply Restriction on enemies who attacks the user for 1 turn.
• Sakura Lucky Bag

  Increase 3% damage, 4% chance to freeze attackers for 1 turn . Frozen target cannot move but damage taken is reduced by 80%
• Bell of Beast

  Recover HP by 3%. 15% chance to absorb 3% HP of enemy who attack you.
• Force of Taowu

  Increases Max. HP by 4% and Max. CP by 4%.
• GM back item
• S75 Trifecta Swords

  It gives off a strange feeling of vigor. Restores CP by 3%. Increases max CP by 7%.
• Puppet: Hakuki (7 Days)

  Increase 3% accuracy.
  Reduce 46 HP damage taken.
  Recover 83 HP when each turn start.
• Scroll: Taiin
• Sakura Rain Battle Umbrella
• Scroll: Red Curse seal
• S14 Yabusa Knife

  Increases 4% attack damage and ignore 4% of targets dodge.
• Tail of Hachibi

  Forged with chakra of the legendary tailed beast, Hachibi. Increase critical chance by 15% but reduce max. HP by 20%.
• Carrot Launcher

  Increase agility by 1. (Easter 2011 Limited Edition)
• Tail of Capricorn

  Increases dodge rate by 4%. Recovers 3% HP with every charge.
• Scroll: Posion Attack
• Big Cask

  Increase max.HP by 15% but reduce max. CP by 5%.
• Scroll: Rikugo
• S56 Curse Brush

  A legendary Ink Brush that has the ability to materialize drawings. Increase critical rate by 5% and accuracy by 6%.
• Puppet: Spider
• Hanami Taiko

  2011 Hanami Festival - Rhythm! Recover HP & CP by 10 every turn.
• Scroll: Messenger (7 Days)

  Increase 2% accuracy.
  Reduce 20 HP damage taken.
  Recover 35 HP when each turn start.
• New Year Kadomatsu

  Recover 100 HP and 100 CP at the start of every turn.
• Sagittarius Hunting Set

  Increases dodge rate by 4%. Additional 80 HP damage on all attacks.
• Charming Aura (Black)

  2012 Valentines day limited aura, increase critical chance 2%.
• Scroll: Kinjutsu I
• 4th Anniversary Back Item

  Ninja Saga 4th Anniversary edition! Recover 50 HP and 150 CP at the start of every turn.