No worries. In the photo it looks like they have their bag sat flat on top of a rack suggesting no use of bagman or seatpost (wouldnt be flat if it was tucked up to the post).
I should add the caveat that I have actually attached the seat post strap to a rack when it has that lip at the front to prevent forward slippage.
@withered_preacher started
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No worries. In the photo it looks like they have their bag sat flat on top of a rack suggesting no use of bagman or seatpost (wouldnt be flat if it was tucked up to the post).