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 :

• Ninja Bag

  Increase healing power of scrolls by 20%.
• Folding Paper Fan
• Newbie backpack (Red)

  Double mission XP reward in level 1 to level 10.
• S9 Warring Empire Guarding Bow

  An ancient enchanted bow with great range used in warfare. Increases accuracy by 10%. Restore 100 HP every turn.
• S47 Kami's Blessing

  Increase critical chance 6% and critical damage 10%.
• S10 Frostguard's Bow

  A magical bow that has a very long range. Reduce target 8% CP on every weapon attack.
• GM back item
• Scarlet Sword Wheel

  Increases damage by 5% and dodge rate by 3%.
• FIFA Whistle

  Recover 100 CP at the start of every turn and reduces damage taken by 80.
• Scroll: Posion Attack
• Childhood Memories

  Mothers Day 2011 Limited Edition
• S2 Demons erosion

  Recovers 4% of the users max HP every turn. Additional 100 damage on all attacks.
• Banana Back Item

  Banana Back Item
• Angel Heart (White)

  16% chance to absorb 2% HP of enemy who attack you.
• Civet Cat Tail
• Black Silver Electric Guitar
• Dark Cry Raijinco
• Shishimai Back

  Restores 3% of users max HP.Has 4% chance to convert damage taken to HP positively.
• Star Dawn Harp

  Increases users agility by 1. Recover CP after HP reduction. (Amount: 10% of HP reduction) Recover HP by 2% when being put on a debuff.
• Musashi Twin Blades
• Master Scroll

  Restores HP & CP by 3%.
• Ronin Idol

  Reduce damage taken by 100 and restores 4% of users max HP.
• 4th Anniversary Back Item

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

  Increases critical rate by 4%. Reduce damage taken by 3%.
• Wind Storm Raijinco
• Big Cheese

  Recover CP after HP reduction. (Amount: 10% of HP reduction)
• S14 Profound Tentacles

  35% chance to restrict enemy who attack user for 1 turn. (Restriction) target will not be able to use any skills.