I picked this one up a couple weeks ago. Works pretty well. I believe Rockbros has one a little larger than this one.

ROCKBROS Bike Panniers for Bicycle, Bike Trunk Bag Rear Bike Rack Bag for Travel Bicycle eBike Accessories Cargo Carrier Bag https://www.amazon.com/dp/B08GKB2NJ8/ref=cm_sw_r_cp_api_i_6M969P5D2TB9G8RSVSVH?psc=1