What are you wanting to carry? Smaller than 4L roll closure ?
Just had a look at the Ortlieb Saddle Bag Large, 2.7l. Think that will suffice
If it uses their click on fixing I would avoid, seen loads fail. Either big x top above or Restrap for magnets.
@MicroDosed™ started
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What are you wanting to carry? Smaller than 4L roll closure ?