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https://www.active-traveller.com/gear-reviews/accessories/millican-smith-the-roll-25l-backpack
Bingo!
"And it has a laptop pocket against your back, with a long, easy-access opening (first surprise; an easily overlooked sewn-in magnet that holds the storm-flap closed over the laptop compartment zip. Genius simplicity)."
Just noticed a flat magnet sewn in next to the zip opening of the laptop compartment of my bag (Millican rucksack).