Back when i was doing the ixali tribe quests i remember having 20-30 items in there on a few occasions(i would grab all 12 quests, go get everything, craft everything, then turn everything in - it led to a lot of items sometimes). This would have been early HW, so i was probly mid 50s on my BLM and doing adventuring quests too. But even 50 seems like a stretch for what we might "need".