EDITED: due to a slight brain fart and new suggestion to add in the same category

current items on my mind

Quest Items(effects type)
Certificate of Dragon Squad(Map Access)
Marble of Chaos(Map Access)
Ludibrium Medal(no longer required to enter Papulatus Map but would make a nice collectible
Sand Bandit's Member Badge(Map Access)
Sakura's Treasure(not sure if this one has an use other than inventory decoration)
others items which i may not know about

Quest Items(Wearable)
Ludibrium Cape
Rag Cape(not sure what its actually call but its rewarded by Alcaster)
the Air Tank from Hughes from Orbis Tower npc(not sure whats its call)
maybe some other items i dont know about rewarded only from quests


Ifia's Gear Bag((9 slots)(require 10 pieces for turn in but having a bag to hold 9 piece untill the tenth is found would be nice


EDIT: the new suggestion added to this edit

increase bag cap from 5 to 6
add new herb and mineral bags with 50 slots(150-200 million cost(3-4 time more expensive than 20 slots bag but with pay off)
for each character on the account that own a 50 slot bag reduce the cost by 10 million for the next char that buy it(maximum of 100M discount)
add 40 slots Production Bags(150 million cost)

---

additional idea that could not fit thread title and part of the edit

Revamped Storages
old storage(locked down from doing anymore deposit in it, and add an auto-transfer of the items to the new storage whenever there enough slots for those items
to move in so that ppl can't leave their item in the old storage and use it as bonus tab)

New Storage(having filter purpose as well as more slots)
unlike the 1 old 1 this new Storage shall be divide in different tabs(easier to locate what we need
Gear/Etc Drops/Familiar Cards/craft material/Use Tab/Cash Tab/Other Tab

Gear tab should start with 10 slots base + 30 extendable slots
ETC tab should start with 20 slots base + 50 extendable(20 million for first ten slot)....35 million for slots 30-40.....50 millions for slots 40-50
Familiar cards tab 20 slots base + 80 extendable(just like ETC incrementally more expensive every 10 slots expended)
Craft Material Tab 20 slots base + 130 extendable(incrementally more expensive every 10 slots expended too)
Use Tab 20 slots base + 80 extendable(incrementally more expensive every 10 slots expended too)(maximum of 10 recipes can be hold in the tab
Cash Tab 30 Slots base + 70 extendable(price the same for every slot extension(no increment since ppl paid $$ for those items)
Other Tab: 10 slot base + 20 extandable(whatever doesn't fit in other categories(Set up, or somehow the maximum in nother tab wasn't enough

for players that already expended their old storage...give a mesos refund for all that was spent on old storage so they can redirect those mesos into the new storage