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.
• S48 Titans Hammer

  The hammer used by titans to destroy castles in ancient times. Increases attack damage by 8% and accuracy by 5%.
• Purple Mixing Yellow Umbrella
• Balloon Rabbit Doll

  Has 8% chance to convert damage taken to HP positively.
• Puppet: Spider
• S37 Ring of Chakra Flame

  Increase attack damage by 7%.
• Drum: Ako
• Silver Torch of Zeus

  Increase mission gold reward by 300.
• Flag: Dragon Symbol
• Gunbai: Gyoji
• Clear Cross

  Increase 3% purify chance. Each turn recover 150 HP and 150 CP.
• S72 Hero Twin Axe

  Increase 12% Combustion Chance and recover 3% HP at the start of every turn. (Minimum requirement of 1 Attribute Point in Fire to activate combustion effect)
• S22 Shinnoto Monks Staff

  Increase 4% critical rate and reduces damage received by 4%.
• Black Double Gun

  Ignore enemys dodge rate by 3%. Increase accuracy by 3%.
• S81 Wheel of Glory

  Reduce damage taken by 200. Increase Combustion chance by 15%. (Minimum requirement of 1 Attribute Point in Fire to activate combustion effect)
• Father's Heart

  Reduce damage taken by 6%.
• S4 Bladed Wings

  Reduce damage taken by 400. Recovers 1% of the user's max HP
• Wine Gourd
• Drum of Euphoria

  Recover 3% HP at the start of every turn, and recover 3% HP with every Charge.
• Scroll: Rikugo
• Triple Taiko

  Increases Max. HP by 4% and healing power of scrolls by 100%.
• Heian-kyo Shamisen
• Charming Aura (Pink)

  2012 Valentines day limited aura, reduce damage 2%.
• S82 Amethyst Skull

  Increase purify chance by 5%. Recover 15% extra CP when charge.
• Scroll: Taiin
• Newbie backpack (Red)

  Double mission XP reward in level 1 to level 10.
• Musashi Twin Blades