A dispensing system for a flexible bag including a spout having a body, a plug and a first and second flexible coupling. The body includes a central bore extending therethrough, with a lower ring wall at a lower end. The plug has a cavity and plug ring wall attachable to the lower ring wall in sealed engagement. The first flexible coupling and the second flexible coupling each being formed from a base web and extending from the lower end of the body. A first arm is coupled to the base web at a first hinge. A second arm is coupled to the first arm opposite the base web at a central hinge. The plug is coupled to the second arm opposite the first arm at a plug hinge. A probe is likewise disclosed that is insertable into a flexible bag, as is a flexible bag assembly and method.