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 :

• S15 Frozen Large Sword

  Increase 7% purify chance.
• Genin backpack (Blue)

  Double mission XP reward in level 11 to level 20.
• 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.
• Four-Point Shuriken
• Togatsuki Paper Fan

  Increase max. CP by 10%.
• S10 Ancient Kikyo Umbrella

  6% chance to convert damage taken into health. But reduce Max.CP by 2%.
• Bat Back Item

  Back item design with reference from Halloween - Bats. Increase 5% dodge rate and decrease damage 5% at the same time.
• S8 Underworld Bulwark

  A phantom shield with demon soul. Reduce damage taken by 10%.
• Cheerful Snowman

  Increase Max. CP by 20%. Recover 2% HP at the start of every turn. but reduce max. HP by 12%.
• S11 Wood Spirit's Bow

  Increase critical chance 13%.
• S29 Yanki Protective Magatama

  Increase accuracy by 8%
• Musashi Twin Blades
• Scroll: Messenger

  Increase 2% accuracy.
  Reduce 20 HP damage taken.
  Recover 35 HP when each turn start.
• Tail of Capricorn

  Increases dodge rate by 4%. Recovers 3% HP with every charge.
• Mother's Hug

  Recover 100 HP and 2% HP at the start of every turn.
• S73 Smite Evil Shield

  Has 25% chance to absorb 2% HP of enemy who attack you. 8% chance to convert damage taken to HP positively.
• Decorate Battle Umbrella
• Purple Dragon umbrella
• Ninjas Stocking

  Increase 5% Combustion chance and attack damage by 3%.
• Firefox Tail
• 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.
• Native Drum

  5% chance to convert damage taken to HP positively.
• Gruidae Wing

  Each turn recover 80 CP. Recover CP after HP reduction. (Amount: 8% of HP reduction)
• Businessman Luggage
• Dark Plate Twin Blades
• Ice Cystal Raijinco
• S17 Scorching Sun Scroll

  Has 30% chance to absorb 1% HP of enemy who attack you.