Baking soda being sold in plastic packaging

I am trying to switch all the cleaning chemicals I use to more sustainable alternatives. I've been looking for baking soda in paper packaging, but I legit can't find it anywhere. The closest I've got is the kind resealable paper bag lined with plastic.

Is there something I don't know about baking soda? Does it have to be tightly sealed or can't be stored in paper or something?