i recommend jpexs free flash decompiler. open your client with it, open the "images" folder and search for the image containing the bag sprites. when you find it, drag and drop the image on your desktop and edit it to your liking. after you are done, go back into jpexs and search for the bag sprite image in the images folder again, rightclick it and press "replace" and choose the edited image you have on your desktop (the one you dragged out and edited) and then press "save" in the top left corner of the program.