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 :

• Ninja Bag

  Increase healing power of scrolls by 20%.
• Chakra Magatama

  Increase 2% accuracy.
  Additional 5 HP damage upon all attack.
• S5 The Guider

  Increase purify chance by 7%. Recover 8% HP when purify. Recovers 4% of the user's max HP.
• White Metal Hammer
• Charming Aura (Pink)

  2012 Valentines day limited aura, reduce damage 2%.
• S12 Blood Evil Gourd

  Increase max. HP by 5%.
• S33 Book of Fate

  Increase Max. HP & CP by 4%
• Charming Aura (Black)

  2012 Valentines day limited aura, increase critical chance 2%.
• Fire Symbol Guitar
• Puppet: Spider
• Champion Cup!

  Ultimate prize for Champions.
• S25 Musha Pipa

  Increase 4% critical rate and ignore 4% targets dodge.
• 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%
• S58 Scroll of Shadows

  Increases damage by 6% and dodge rate by 5%.
• Rose Cloak

  Restores 80 CP at the start of every turn. Converts 8% of damage taken into CP.
• Gemini Halo Glyph

  Increases damage by 4%. Reduce damage taken by 65.
• Crystal Ice Mirror

  5% chance to freeze enemy who attack user (1 turn). Frozen target cannot move but damage taken is reduced by 80%
• S29 Yanki Protective Magatama

  Increase accuracy by 8%
• Toxic Village Poison Potion
• Chakra Message Stick
• Butterfly Wings
• S16 Umbra Fire Wheel

  Additional 170 HP damage upon all attack.
• Yatai Lantern
• S15 Frozen Huge Sword

  Recupera 26% extra CP en cada recarga.
• Blue Crystal Wings

  Recover 15% extra CP when charge.
• S70 Magical Cobweb

  Restores CP by 3%. 30% chance to restrict enemy who attack user for 1 turn. Restriction target will not be able to use any skills.
• New Year Kadomatsu

  Recover 100 HP and 100 CP at the start of every turn.