I have a G21 now and I don't use that bag, but I used it previously in my 230 where it filled almost completely. Even though it's a shorter boat, the bow space under the seats in the G21 is at least as big or bigger than the 230 so it should fit well. One thing to be mindful of is unlike the 210/230 the built in ballast in the G21 is bags rather than a hard tank. Because of this, I'd recommend installing it using a y connector that you can flip between bags rather than the piggy back method. You can probably make the piggyback method work, but you would need to make sure the bags don't create a vacuum as that would stop it from draining the second bag and potentially damage your pump. You can call wake makers for advice as well as they are familiar with all the boat ballast systems and will know what works best.
I would agree with the comment of having some lead bags to offset the torque prop which is pretty pronounced in the G21. I have actually have 400lbs under the passenger seat...200 for torque prop and another 200 to offset the driver (we often have a 2 person crew) If you typically have at least 3 people going out, then you'd just need the first 200.
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