The current 2023 tour/midsize bag are black/white with black lettering. The previous 2021 models were black with white lettering and the 2019 models were black/white with black lettering, similar to the current model. Based on that, I would say every two years. I have the 19 and 21 mid size models and have an extra belly panel with my name and TT logo that will fit either bag. I love the midsize bags. For many years they went with the Traditional black/white bag with black letters. Glad to see them back with that bag.