A detailed pic of Kat's trainer bag.
The bag itself is based on a bag type called "Große Kampftasche" in german and is usually used by german soldiers, but by civils as well. It's made of heavy thick olive green canvas and has two pokemon patches sewed on top. The pokeball pattern is painted and some charms are hanging down the sides (not pictured).
Kat's trainer bag
by Kat's Absol