This bag is provided in the Spark combo.
It is perfect for a daily use. Light, easy to carry,... contains RC + Spark and his battery + 2 batteries + your phone + anything that can fit in the small pocket (usb cable, spare props,...)
I like it quite a lot
I am using a lowepro tahoe bp150 backpack for my fuji x-t20, it can easily fit the spark,rc,4 batteries, its padded so shock proof and weather sealed in case of rain. You have 2 external pockets, one of them can fit an ipad, the other keys. I love rhis backpack. Check my review Lowepro Tahoe BP150 backpak review