I"ve been using a North Face Surge. Brilliant, like it's not there. Minimal Hi Viz features, which is corrected using a waterproof Hi-Viz cover.Many years ago I needed a walking rucksack for my daughter
We looked in a shop in Betws-y-Coed because we lived near there (ish)
Her favourite was a bright yellow ladies cycling backpack
Never seen one like it since - but it had a stretchy string bag on the back for a helmet and the lightweight frame held most of it away from the rider so allow air to circulate
Brilliant design - wish I could find one like it but bigger - no idea of the make