Are you comparing it to what's currently in the game right now? Or what you expect will be implemented from renewal? I should say I haven't played renewal so admittedly I don't know what's in store for the future of Odin. I'm judging Amistr Bag based on the items we currently have. Endure is an MVP Card. Greed can double farming speed depending on the map. Many of the other skills can be compared to having a third accessory slot. +1 to all stats may not matter much in renewal mechanics but it's still the most stats in any garment. Exp and Drops +2-5% is just a small boost but it's a unique effect that applies universally. 3 sp per kill speeds up farming immensely by cutting regen time, alleviating supply cost and freeing up weight limit. It has more defense than a Manteau without the class requirement. By what scale of power are you judging it?
This garment is better than the actual ones? yeah
Is OP? No
What is coming from renewal OP garments?
Heroic Back Pack [1] Give you greed skill lv 1 and depends in your stats and upgrade give you bonus, Example:
If your HBP is upgrade to +7 and your VIT is 90+ (only base VIT, the bonus stats dont help) give you resistance to neutral attacks 5%, if you HBP is upgrade +9 or higher give you another 5%
Archangel Wings [1] Enchants available via Silvervines, example: Heal Amount lv 5 Heal +20% / Increase the SP consumtion 15%
And finally the worse one, even with jRO kafra items is still the best garment right now lol, just check:
Fallen Angel Wings [1]
Luk + 2
Atk + 1 for every 20 base Str.
Matk + 1 for every 20 base Int.
Aspd + 1% for every 20 base Agi.
Increases long-ranged damage on targets by 1% for every 20 base Dex.
Increases critical damage on targets by 1% for every 20 base Luk.
Reduces damage taken from Neutral property attacks by 1% for every 20 base Vit.
Is not good enought? dont worry, there are enchants available and of course at your choice, a good example: Spell enchant lv 6 (+21 MATK -10% cast time)...oh i forgot, you can give 3 enchants the same time or different to the garment and the last one is more powerful Spell enchant lv 7 (+24 MATK -10 cas time)
So, this is what coming to Odin, no yet but soon, Archangel and Fallen wings come after of malangdo get implement (so after of 3rds class coming to the server), so... here are the garments release from Kafra shop to iRO (kRO have so many worse things, but in costumes lol) listed from weak to nightmare:
Amistr Bag actually in game (still trying to figure where is the OP thing everyone cry about it...)
Archangel Wings alone is just a garment without stats or power but with good enchants
Heroic Back Pack Here is where Nightmare start, there is no garment in the actual game or future beat it so yeah here is the 1st OP garment from Kafra shop.
Fallen Angel Wings Here is the problem, this is what you can call OP
As i already told you Fallen and archangel wings come after of 3rds class so dont worry, but since HBP is already with all effects from kafra and dont need enchants is there a chance to come into the server in any moment.