I use canon 600sr sling bag. Any bag "made for drone" will be over priced. Got it on sale at Walmart in Canada for $40.00. Holds from top to bottom. Top compartment charge cords and block, extra props. Middle is batteries, controller. Bottom is drone. On the front compartment is polar lenses, ipad mini.
I bought this one on ebay for $30, it is light weight, waterproof, hard shell top and takes all that I need to fly with including three additional batteries. Can't beat the price or light weight and it is comfortable to wear when hiking about.