Anyone know where I can get Mallory's backpack from Welcome to the Rileys?

In the movie, Welcome to the Rileys, Kristen Stewart's character, Mallory, carries around what looks like a dull green backpack with her. I've already looked on coolspotters, but no luck. She has it in the scene where Doug buys her a po'boy and a lot of other scenes, like when she's going to work at the strip club. Hoping someone recognizes it so I know where to get it. Thanks! :)