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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)."
Is it meant to hold the flap closed over the zip? Looks like there might be another magnet in the corresponding position