Hollister TANDEM Stoma bags Even in two-piece systems, the combination of traditional and consolidated products and innovative products is evident. The Tandem belongs to the first category, very appreciated for its simplicity and safety. The exclusive \"floating flange\" Hollister, which excludes the need to exert pressure on the abdomen, and the \"Center Point Lock\" closure system, specially designed to guarantee optimal sealing conditions between the bag and the plate, are the best guarantees of a system used by thousands of ostomates all over the world. The system is also available with convex plates of various sizes, in the presence of a retracted stoma.