How to add different colors inside a circle in Photoshop?

Hi

Try this:

Use the shape tool to draw a circle (filled with any colour)

On the layer above use the marquee tool to draw two rectangles filled with green and red.

Now click on the border so that the top coloured layer clips to the circle below

Now convert those two layers into a smart object and duplicate that mart object object twice so that you have a total of three circles.

Now it is just a matter of using the transform tools to put each circle onto each bag as below

I hope that helps

Dave