We don't usually use a saucer with our morning mug of tea. Instead, the tea bag finds itself on the side of our breakfast plate, steeping in the cup too long, sitting in the sink, or, on particularly bleary mornings, making stains on our wood counter top. All to prevent the need to wash one more dish or make an extra trip to the garbage. Not a problem with the pouch mug.
The pouch could also be used to dress up coffee or hot cocoa with a cookie, chocolate or cinnamon stick.