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 :

• S26 Bashosen

  Increase 10% Combustion chance.
• Christmas Bag

  Reduce damage taken by 10.
• Universal Backpack

  Increase healing power of scrolls by 100%. Each turn recover 140 HP.
• Charmed Heart

  Theres no escaping love. Increases accuracy by 5%. Adds 40 damage in all of your attacks.
• S25 Musha Pipa

  Increase 4% critical rate and ignore 4% targets dodge.
• Yolanda Rescue First Aid Kit
• Flag of the Burning Legion

  Reduce 3% damage taken and 12% chance to absorb 2% HP of enemy who attack you.
• S55 Mirror of Fantasy

  Increases damage by 6% and accuracy by 5%. Has a 7% chance to convert any damage taken to HP.
• Water Symbol Guitar
• S83 Four Wings

  Increase dodge rate by 8%.
• S77 Curse Dragon

  Increases attack damage by 9% and critical damage 10%.
• Ninja Postman Bag

  Increase healing power of scrolls by 50%.
• S11 Wood Spirit's Bow

  Increase critical chance 13%.
• Giant Copper Coins

  Increase Mission gold reward by 30%.(Mission Only)
• Grave of the Undying

  Increase purify chance by 8%, but decrease agility by 15.
• Ninja Bunny Doll

  Increase 2% damage and ignore 3% targets dodge.
• S18 Evil Spirit Wings

  Increase 10% critical rate.
• S67 Omni Cloud

  Increase accuracy by 6% and dodge rate by 5%.
• Christmas Wreath

  Increase agility by 1 and Max HP by 1%.
• Virgos Eternal Wings

  Increases agility by 1. Increases users attack damage by 3%.
• S50 Blood Shade Magatama

  Created with blood and molten lava, the blood shade magatama consumes the life force of anyone with malicious intent. Has a 8% chance to absorb 10% of the attackers max HP and 8% chance to convert any damage taken to HP.
• Cheerful Snowman

  Increase Max. CP by 20%. Recover 2% HP at the start of every turn. but reduce max. HP by 12%.
• Emblem backpack (Yellow)

  Double mission XP reward in level 1 to level 20.
• S18 Evil Spirit Shield

  Reduce 14% damage taken.
• S12 Golden Bujin Ax

  Increase attack damage by 20% but increase damage taken by 12%.
• Great Wooden Hammer (3 Days)

  Increase healing power of scrolls by 50%.
  Reduce 8 HP damage taken.
• Holiday Doll

  Expecting Santa in every year! Critical and dodge rate increase 3%.