There are a few options for removing ink from a fabric bag. One is to use rubbing alcohol or hairspray, which can help break down the ink. Another is to try using a mixture of equal parts white vinegar and baking soda to create a paste, which can be applied to the stain and then washed off. You can also try using a specialized ink remover or taking the bag to a professional cleaner. However, it is always best to test a small, inconspicuous area of the bag first to ensure that the method you choose will not damage the fabric.