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The supplied one isn't that small (pipedream 400) but I am going to try really going nuts on it in a smaller dry bag. The seatpack this time wasnt a v big one, I have one of the OG medium apidura back country things I'll use for AMR, but it's still 7L. Bag went in there loose, kneeling on it etc, and could barely get the thing closed
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I don't know how big that seatpack is. I've always used a Revelate Viscacha which is 7-14L I think and would be pretty full for most races.
Was it in a stuff sack first?