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 :

• Hanami Folding Fan

  2011 Hanami Festival - Usagi! Increase dodge rate and critical rate by 3%.
• Taoist Spirit Stone

  Increases Max. HP by 3% and Max. CP by 5%. Increase purify chance by 1%.
• Emblem backpack (Yellow)

  Double mission XP reward in level 1 to level 20.
• Seal Nightmare Wing

  Ignore 4% targets dodge.
• Crystal Ice Mirror

  5% chance to freeze enemy who attack user (1 turn). Frozen target cannot move but damage taken is reduced by 80%
• Father's Heart

  Reduce damage taken by 6%.
• Sand Gourd
• Ichimoku Gourd
• Chakra Message Stick
• Pirate Skull Flag

  Increase 6% purify chance. Reduce damage taken by 5%.
• Shishimai Back

  Restores 3% of users max HP.Has 4% chance to convert damage taken to HP positively.
• S11 Wood Spirit's Shield

  Increase max. HP by 9% and 20% chance to absorb 3% HP of enemy who attack you.
• Great Wooden Hammer (7 Days)

  Increase healing power of scrolls by 50%.
  Reduce 8 HP damage taken.
• Dark World Hammer
• Spartan Shield

  Restore 100 HP every turn. Reduce damage taken by 5%.
• S9 Ancient Akazonke Gunbai

  Increase critical rate and accuracy by 4%. But reduce Max.HP by 2%.
• Water Energy Skis
• S43 Extreme Lotus

  The back item contains 30% chance to absorb 3% HP of enemy which makes attack on you.
• S2 Ancient Bone Claw

  An ancient bone that emanates great power. Increases accuracy by 8%. Recovers 100 HP every turn.
• Peom Fan

  Reduce 46 HP damage taken.
• Ghost Spider

  Reduce 72 HP damage taken.
• Native Drum

  5% chance to convert damage taken to HP positively.
• S69 Skull Cloak

  Increases Max. HP by 4%. Restores HP by 4%. Increase attack damage by 6%.
• Green Koi
• S39 Spike Hammer

  Increase accuracy by 10% but reduce max. HP by 10%.
• Grand Light Gourd

  Increase 3% damage
• Giant Copper Coins

  Increase Mission gold reward by 30%.(Mission Only)