okay, i actually don't know if someone already suggested this or if it's possible, but
there are a lot of double items ー two examples are [Cobo] Red-Bean Sherbet and Red-Bean Sherbet ー which easily fill up the inventory, since they aren't stackable;
these consumables have the same effectsーas they both recover 100% HP and 100% MP.
this happens to other items too, like [Luriel] Heroic Invitation and Heroic Invitation, not to mention that this item has a [Normal] version too.
certain items have three versions, like [Cobo] Elrianode Defense Request, [Luriel] Elrianode Defense Request and Elrianode Defense Request.
the only difference is that the [Luriel] and [Cobo] versions are unsellable and untradeable, so this is my suggestion:
merge all these items.
by 'merging' them i mean putting them in the Naeun's Exchange section:
[Cobo] Elrianode Defense Request > Elrianode Defense Request
[Luriel] Elrianode Defense Request > Elrianode Defense Request
[Luriel] Heroic Invitation > Heroic Invitation
Heroic Invitation > Heroic Invitation
[Cobo] Red-Bean Sherbet > Red-Bean Sherbet
this is a lot of work, since there are surely other items that have useless versions of them.
this is my first suggestion, so i want to know what you think about this, also please vote on the poll!
that's all! english is not my first language but i hope i wrote in an understandable way. if you want to ask or add something regarding the suggestion, please let me know!