Assertion: backpack | /r/HasProperty | introduced into the game
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Source sentences:
text: The backpack (along with the class loadout screen proper) was introduced into the game some time between the Scout and Sniper vs. Spy Updates, with an initial storage capability of 50 items even though it could only store the 12 unlocked achievement items at that point (which could be comically deleted and never re-earned: April 20, 2009 Patch).