I found a tiny problem related to the 300 item limit - 3rd job advancement.
When you are at your maximum item limit, the guardian will not allow you to job change (after clicking on "check" on the screen that shows "before" and "after"), and will say you have 300 items (coincidentally, I may have at least 300 items upon completion of the final quest). The job change will not occur.
Afterwards, you would be stuck there (frozen), unable to move at all. The dialog box is unresponsive. The only remedy is to restart the Trickster Client.
I had to throw several cards out (6 just in case - roughly the same amount as the currently mounted equips as I presume that may be causing it, though I guess only 1 was probably needed anyway) before I can job-change. After job-changing, I can pick up all the cards I have thrown, without equipping my equipment that were unequipped.
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When you are at your 300 item limit, you may not be able to buy any item from NPCs. If you do, the purchase dialog box closes without clear prompting. The only indication that you are unable to purchase anything would be shown in your chat-box (i.e. "Failed in purchasing item" or something to that extent). This may also apply to private shop purchases.
If you have 300 items, you cannot pick up anymore items, even those stackable items already in your inventory. You can however use items in your inventory. You can change equips while having 300 items.
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It is possible to have more than 300 items. Some quests do not check if after doing the quest you will receive more than 300 items. However, they will check if you are currently carrying 300 items. You can do the quest if you have less than 300 items (however, you *might* be able to do some quests even if you have exactly 300 items). Hence by doing a quest which gives you at least 2 items, you may be able to get 301/302 or more items in your inventory.
You can do quests that do not give you any items even if you have 300 or more items, e.g. certain monster quests.
redos - lvl 22x wizard