Idea:
During the Winterfest event, after completing your hub quests, a cool reward would be Santa’s Bag.
More information:
The Backbling cosmetics are coming out with the Endolotl Plush, and the first one will be an Endolotl Backbling. For more information, visit this or this link.
Anyways, Santa’s bag would be a big bag on your back and it would contain presents inside. It could have two variants, a brown bag, and a red bag.