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 :

• Harvest Treasure Bag

  Reduce damage taken by 140. Recover 5% extra CP when charge.
• Assault Kite

  Recover 100 HP and 80 CP at the start of every turn.
• Shoguns Badge Gourd

  Increase Max. HP & CP by 3%
• Black Koi
• Mech of Wing

  Reduce damage taken by 10%.
• Iron Tortoise Shell

  Reduce damage taken by 200.
• Call of the Angel

  Reduce damage taken by 100. Has 6% chance to convert damage taken to HP positively.
• Successor Fan

  Restores HP & CP by 2%. Has 7% chance to freeze enemy who attacks user (2 turn). Frozen target cannot move but damage taken is reduced by 80%.
• S42 Tendo Tips

  Increases attack damage and reduces damage received by 5%.
• Python Scales Raijinco
• Book of Slate

  Decreases Max. HP by 1% and Increase Max. CP by 10%. Increase 3% purify chance.
• Scroll: Genbu
• Santa Gift Bag

  Reduce damage taken by 30.
• Curved Spear
• Spiked Blade

  Increases dodge and critical chance by 4%. Recovers 70 HP each turn.
• Water Shark Skis
• Paper Umbrella

  Increase dodge by 3%. Reduce damage taken by 80.
• Horror Scarecrow

  Increase attack damage by 5%. Reduce damage taken by 150.
• Hanami Lantern

  2011 Hanami Festival - Shine! Reduce damage taken by 15.
• S4 Bladed Wings

  Reduce damage taken by 400. Recovers 1% of the user's max HP
• 4th Anniversary Back Item

  Ninja Saga 4th Anniversary edition! Recover 50 HP and 150 CP at the start of every turn.
• Christmas Chimney

  4% chance to freeze enemy who attacks user (1 turn). Frozen target cannot move but damage taken is reduced by 80%.
• S32 Black Senbu

  Recover HP by 4% and reduces damage received by 3%.
• Great Wooden Hammer

  Increase healing power of scrolls by 50%.
  Reduce 8 HP damage taken.
• Steel Frame Tail
• Fairy Wings

  Fairy wings that owned by a fairy
• Ninja Snowman

  3% chance to convert damage taken to HP positively.