I'm using a Macbook Pro with a 512GB SSD but I dual boot so really if I boot into Mac or Win each only have 128GB available not including what the OS uses of th

I'm using a Macbook Pro with a 512GB SSD but I dual boot so really if I boot into Mac or Win each only have 128GB available not including what the OS uses of that 128GB. My plan was to triple boot but not with such limited space. Oh and the recovery partitions eat up a lot too I haven't checked exactly how much.