What is thicker a 28 Ga or a 30 Ga PVC bladder?

A 28 gauge (Ga) PVC bladder is thicker than a 30 gauge PVC bladder. The lower the gauge number, the thicker the material; thus, 28 Ga indicates a greater thickness compared to 30 Ga. Consequently, if you need more durability or strength, the 28 Ga option would be preferable.