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 :

• Universal Backpack

  Increase healing power of scrolls by 100%. Each turn recover 140 HP.
• S8 Scroll of Golden Snake

  Increase all attack damage by 4%. Decrease damage taken by 4%.
• S21 Rokulin Gunbai

  Ignore enemys dodge rate by 8%.
• Native Horn

  Increase max. CP by 3%, Recover 1% HP with every Charge.
• Scroll: Messenger (3 Days)

  Increase 2% accuracy.
  Reduce 20 HP damage taken.
  Recover 35 HP when each turn start.
• S48 Titans Hammer

  The hammer used by titans to destroy castles in ancient times. Increases attack damage by 8% and accuracy by 5%.
• S41 Dragon Gunnery

  Increase 25% Combustion chance, Ignore enemys dodge rate by 5%. (Minimum requirement of 1 Attribute Point in Fire to activate combustion effect)
• Mace of Pandemonium

  Increases attack damage by 6%. Has 4% chance to convert damage taken to HP positively.
• S10 Frostguard's Shield

  Shield of the valiant warrior Tundra. Increase agility by 2. Has 17% Chance to stun target when attack with weapon for 1 turn.
• Banana Back Item

  Banana Back Item
• Black Koi
• Santa Gift Bag

  Reduce damage taken by 30.
• Assault Kite

  Recover 100 HP and 80 CP at the start of every turn.
• S15 Frozen Large Sword

  Increase 7% purify chance.
• Firefox Tail
• Egg Hunter Basket

  Increase 6% accuracy. (Easter 2011 Limited Edition)
• Cupid Wing

  Increase critical chance 4% and critical damage 10%.
• Raijin Raijinco
• Scroll and Blade

  Has 11% chance to restrict enemy who attack user for 1 turn. Restriction target will not be able to use any skills. Increase critical rate by 5%. 8% chances of using Jutsu without CP.
• Hide Guitar
• Love Ribbon

  Additional 40 HP damage upon all attack.
• Angel Heart (Black)

  Reduce target 8% CP on every weapon attack.
• Justice and Freedom

  Flag of the United States of America which symbolizes freedom and liberty. Recover 3% HP with every charge. Increases critical rate by 3%. Reduces damage taken by 50.
• Togatsuki Paper Fan

  Increase max. CP by 10%.
• Christmas Deer

  Increase critical chance 2% and critical damage 6%.
• Water Shark Skis
• Angel Wings

  Increase 3% attack damage and ignore 3% targets dodge.