Thoughts on a toy size or smaller cockapoo

We have had two mini cockapoos over the years. Each was in the 25 pound range. I think I’d like to have a smaller dog so it can travel more easily with us. The definitions of size designations seem unclear. Some are called “toy,”others are called “teacup” and I just saw “micro” (because the breeder says “teacup“means 10-15 pounds and “micro” is under 8 pounds. We very much would like a dog that weighs 10-15 pounds. Lighter would be fine. Heavier would be a problem. So, we prefer the smaller side. Has anyone been successful finding a breeder who accurately predicts a very small cockapoo? We greatly would appreciate your thoughts.