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 :

• Yolanda Rescue First Aid Kit
• Orange Koi
• Engagement Ring

  Additional 20 HP damage upon all attack.
• S13 Slaughter Giant Axe

  Increase max.HP by 20% but reduce max. CP by 35%.
• Genin backpack (Blue)

  Double mission XP reward in level 11 to level 20.
• Gunbai: World Peace
• Carnival Fan

  Dance with the Fan during Ninja Saga Anniversary Carnival! Increase all attack damage by 3%.
• Dark Blade

  Increase 2% critical rate and ignore 2% of targets dodge.
• Red Shell
• Poor Bag

  7% chance to convert damage taken to HP positively. Reduce damage taken by 5%.
• Purple Mixing Yellow Umbrella
• S51 Enchanted Winged Carapace

  Increases accuracy by 3%. Recover 4% HP at the start of every turn.
• S18 Kamimachi Lantern

  Increase 4% critical rate and recover HP by 1%.
• Bell of Fortune

  6% chance to restrict enemy who attack user for 1 turn. Restriction target will not be able to use any skills.
• Chakra Ancestor Flame

  Reduce damage taken by 175. Has 5% chance to convert damage taken to HP positively.
• War Flag: Furinkazan
• FIFA Whistle

  Recover 100 CP at the start of every turn and reduces damage taken by 80.
• Spiked Blade

  Increases dodge and critical chance by 4%. Recovers 70 HP each turn.
• Umiyuki Painted Wood

  Reduce 24 HP damage taken.
• S18 Evil Spirit Shield

  Reduce 14% damage taken.
• S26 Bashosen

  Increase 10% Combustion chance.
• Nutcracker

  Increases Max. HP by 4% and damage by 3%.
• Three Ring Magatama

  Increase 2% accuracy.
  Additional 12 HP damage upon all attack.
• S14 Profound Pincers

  20% chance to freeze enemy who attack user (1 turn). Frozen target cannot move but damage taken is reduced by 80%.
• Large Wooden Hammer
• Cupid Wing

  Increase critical chance 4% and critical damage 10%.
• Wings of Eternal Eclipse

  Increases critical chance by 3%. Ignores 6% of the targets dodge rate.