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 :

• Shinobi Curse Battle Umbrella
• Great Wooden Hammer (3 Days)

  Increase healing power of scrolls by 50%.
  Reduce 8 HP damage taken.
• Emblem backpack (Yellow)

  Double mission XP reward in level 1 to level 20.
• S9 Warring Empire Bulwark

  A strong and sturdy shield. Reduces damage taken by 35% but reduces the user's agility by 15.
• Ninja Bag

  Increase healing power of scrolls by 20%.
• Bell of Fortune

  6% chance to restrict enemy who attack user for 1 turn. Restriction target will not be able to use any skills.
• S8 Scroll of Golden Snake

  Increase all attack damage by 4%. Decrease damage taken by 4%.
• S62 Black Steel Swords

  Restores 5% of users max HP.
• S2 Ancient Bone Claw

  An ancient bone that emanates great power. Increases accuracy by 8%. Recovers 100 HP every turn.
• Chakra Message Stick
• Ronin Straw Hat

  Additional 100 HP damage upon all attack.
• Flag of the Burning Legion

  Reduce 3% damage taken and 12% chance to absorb 2% HP of enemy who attack you.
• S15 Frozen Large Sword

  Increase 7% purify chance.
• S33 Book of Fate

  Increase Max. HP & CP by 4%
• Ocean Ring

  Increase 1% accuracy.
  Additional 2 HP damage upon all attack.
• Purple Mixing Yellow Umbrella
• Red Shuriken Skis
• Shoe of Bounty

  Increase dodge rate and critical rate by 4%.
• S18 Kamimachi Lantern

  Increase 4% critical rate and recover HP by 1%.
• Heian-kyo Shamisen
• S9 Warring Empire Guarding Bow

  An ancient enchanted bow with great range used in warfare. Increases accuracy by 10%. Restore 100 HP every turn.
• S17 Scorching Sun Lantern

  Recover 10% cp after dealing damage.
• Mimosa
• Dark Evil Sickle

  Exclusive Halloween item - the devils sickle that has 10% chance to absorb 1% HP of enemy who attack you.
• Mirror of Shamisen
• S10 Ancient Kikyo Umbrella

  6% chance to convert damage taken into health. But reduce Max.CP by 2%.
• Flag: Dragon Symbol