Yeah there would be a little more room. You could possibly pack a small snack and your glasses (w/ no case) along with the other items in there. It would probably be a tight fit though because of the long shapes of the sunglasses/eyeglasses together.
Just to note, if you pack it to the brim and you’re wearing it across your chest it would be hard to grab things easily since all of the items will be stacked. Also, you would need to make sure nothing falls out. Every time I’ve used it, I’ve only packed my card holder, key pouch, and wet ones so it’s not over-full.