I was wondering if anyone knows why isn't in user shops? It showed up in trapped minions and it's also on my WL

According to SubetaLoge: Select after opening Mountaineer Satchel

And apparently that's a Winter MC item. Maybe nobody typically picks it/those that do stick them in the Minion Zoo/to their pets?

I didn't know it was a MC item. Thank you! I was able to buy a bag and select the minion. I also need the book haha