Zipper Cover??

I have a 2019 Hobonichi Techo Planner and I am using as a wallet/planner. Is there a zipper pouch available out there for this size of planner?? I find,I am constantly worried my cards and i.d’s will fall out. I currently have the Planner with the black exterior, light blue interior cover with the two pen loops. I’d Love input and suggestions! TIA