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 :

• S24 Junsei Ring

  Increase max. HP by 5%.
• S9 Ancient Akazonke Gunbai

  Increase critical rate and accuracy by 4%. But reduce Max.HP by 2%.
• S55 Mirror of Fantasy

  Increases damage by 6% and accuracy by 5%. Has a 7% chance to convert any damage taken to HP.
• Emblem backpack (Yellow)

  Double mission XP reward in level 1 to level 20.
• Call of the Angel

  Reduce damage taken by 100. Has 6% chance to convert damage taken to HP positively.
• Businessman Luggage
• Light Cry Raijinco
• Twins Sakura

  Ignore 5% targets dodge.
• Basic Jounin Battle Gear
• Bell of Beast

  Recover HP by 3%. 15% chance to absorb 3% HP of enemy who attack you.
• S61 God Dragon Flag

  Increase critical rate by 6%. Has 20% chance to apply Restriction on enemies who attacks the user for 1 turn.
• S2 Ancient Bone Claw

  An ancient bone that emanates great power. Increases accuracy by 8%. Recovers 100 HP every turn.
• Axe Hammer suit

  Increases damage and accuracy by 6%. Recover 50 HP at the start of every turn.
• Rose Cloak

  Restores 80 CP at the start of every turn. Converts 8% of damage taken into CP.
• Extra Large Presents Bag

  A large present bag, but nobody knows what it contains.
• Wooden Hammer
• S9 Warring Empire Bulwark

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

  Recover 100 HP and 2% HP at the start of every turn.
• Frost Soul Electric Guitar
• S13 Kishu Twin Blades

  Increase accuracy by 8%
• Enternal Love Scroll

  Increase 5% Combustion chance and reduce 1% damage taken.
• Tail of Jyubi

  Forged with chakra of the legendary tailed beast, Jyubi. Increase attack damage by 15% but reduce max. CP by 30%.
• S12 Blood Evil Gourd

  Increase max. HP by 5%.
• S44 Earth Caller

  Increases attack damage by 4% and max HP by 5%.
• Brilliant Stock Pot

  Increase max. HP by 8% and purify chance by 2% but reduce max. CP by 8%.
• Ritual Taiko
• Horror Scarecrow

  Increase attack damage by 5%. Reduce damage taken by 150.