Carol,
I have used this one for quilting projects such as binding to make a good miter. My bottle says " Premium all purpose adhesive" on the front.
https://www.aleenes.com/aleenes-original-tacky-glue
Check the labels for the features you need. You will want one that dries clear and is permanent so the bag can be washed.
This one shows how to attach the binding trims. Lots of good info in the tutorials.
https://www.byannie.com/make_simple_project_videos/
Hope that helps!
PS: Do you mind sharing the name of the bag pattern? I have started looking at different ones.