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Just use a regular rear rack and save about 100g more.
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I've often thought that this is the better way to go. If you took something like a Tortec ultralite which is only about 500g in the first place, you could just strap the bag straight onto it that would get the centre of gravity lower and you'd have a lot less hassle with the load shifting about when you are climbing. OK, so rack bags aren't cool, but there are quite a few light-weight racks that have a lot of "excess" struts that could be cut off. I wonder how much you could cut down a Blackburn EX1 rack and still have it survive?
This rack looks great for dropper + luggage. It's custom. You could design one in such a way that it takes a normal seatpack turned upside down, using the rack rails instead of saddle rails and lowest portion of seat tube/post
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