Got the 5.3L size for my Topstone XL, and it fits perfectly. Only used it on a few rides so far, but it has great build quality and lots of room for tools, water, snacks, clothing.
The large fit my 59 cm Warbird perfectly, great amount of space for everything you need for a full day on the roadtrail. I have ridden with it in some strong rain and everything inside stays perfectly dry. I would highly recommend this to anyone looking for a great half frame bag.