There is a gap behind the bottom rectangle of back padding with openings either side that you can feed the waist strap into to tuck it out of the way.
I'd entirely forgotten about that. I rode in with mine today thinking it's a bit weird that a cycling rucksack doesn't have a waist or sternum strap.
@aggi started
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There is a gap behind the bottom rectangle of back padding with openings either side that you can feed the waist strap into to tuck it out of the way.