<p>There's no such thing as 'The 25th Anniversary Backpack'. There's a backpack called "<a rel="nofollow" href="https://tibia.fandom.com/wiki/Changing_Backpack?so=search">Changing Backpack</a>", which is a drop from Lord Retro, the boss from the new quest which is a permanent addition to the game. So unless its loot is changed, the The backpack will also be obtained after the event, unlike the 15 (<a rel="nofollow" href="https://tibia.fandom.com/wiki/Anniversary_Backpack?so=search">Anniversary Backpack</a>) and 20 (<a rel="nofollow" href="https://tibia.fandom.com/wiki/Birthday_Backpack?so=search">Birthday Backpack</a>) years backpacks.</p>backpacks.</p><p></p><p>The other way of getting Changing Backpack is by exchanging your Theon points with NPC Theodora- the cost of it is 5,000 Theons. </p>