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 :

• Moai Flagon

  Increase Max. HP by 3%. Reduce damage taken by 100.
• Big Cheese

  Recover CP after HP reduction. (Amount: 10% of HP reduction)
• S17 Scorching Sun Lantern

  Recover 10% cp after dealing damage.
• Chakra Magatama

  Increase 2% accuracy.
  Additional 5 HP damage upon all attack.
• S5 Umbrella of Spiritual Pulse

  Recover CP after HP reduction. (Amount: 10% of HP reduction) Recover 5% CP every turn if current CP is less than 50%. Has 8% chance to reduce skill cooldown by 1 turn at the start of each turn. (Not effective on talent skills)
• Spirit Flag

  An inspiring banner that boosts the holders morale. Increase critical chance and dodge rate by 3%.
• Brilliant Stock Pot

  Increase max. HP by 8% and purify chance by 2% but reduce max. CP by 8%.
• S7 Gorgeous Butterfly

  Increase agility by 2. Recover 20% extra CP when charge.
• Shishimai Back

  Restores 3% of users max HP.Has 4% chance to convert damage taken to HP positively.
• S2 Ancient Bone Claw

  An ancient bone that emanates great power. Increases accuracy by 8%. Recovers 100 HP every turn.
• S13 Ancient Kishu Twin Blades

  Increase accuracy by 6%
• Carnival Fan

  Dance with the Fan during Ninja Saga Anniversary Carnival! Increase all attack damage by 3%.
• Soul of Egg Hunting Beast

  2012 Egg Hunting Event
• S9 Akazonke Gunbai

  Increase 4% critical rate and ignore 4% targets dodge.
• Steel Frame Tail
• S38 Genrei Fan

  Increase max.CP by 50% but reduce max. HP by 20%.
• Scroll: Rikugo
• Businessman Luggage
• Mech of Wing

  Reduce damage taken by 10%.
• Lovely Santa Bag

  A bag that resembles Santa Claus, it emanates faint revitalizing aura. Restores 140 HP and 30 CP at the start of every turn.
• Christmas Wreath

  Increase agility by 1 and Max HP by 1%.
• Ocean Ring

  Increase 1% accuracy.
  Additional 2 HP damage upon all attack.
• Christmas Deer

  Increase critical chance 2% and critical damage 6%.
• Water Energy Skis
• Christmas Treasure Bag

  Increase agility by 1.
• S33 Book of Fate

  Increase Max. HP & CP by 4%
• S40 Gozen Breeze Back Item

  Recover 7% HP with every Charge.