If two fish are caught at once with high Agility, the urn only fills with experience from the first catch. The second does not count. Similarly, bonus experience from items such as the Mad Necklace, Lamps, or Bonus Experience Weekend, do not count towards the urn's filling. Only 10 full urns may be held at a time. Once this limit is reached, at least 1 must be teleported before filling another. As of an update on 20 July, 2017, runed urns now stack in your inventory. When a new urn is started, it will come off the stack and take up an additional space in your inventory.