Just weighed it without the strap or bungees and it was 674g
Edit - just updated the weight, it wasn’t entirely on the scale. I think they have it on the Kickstarter page.
The Jack seems rather heavy at 700g ("including retention strap, 'M' load strap, material base and 31.8mm spacers"). A classic Blackburn EX1 rear rack is 535g and rated to carry 18.2kg.
@Nick_S started
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Just weighed it without the strap or bungees and it was 674g
Edit - just updated the weight, it wasn’t entirely on the scale. I think they have it on the Kickstarter page.