Almost perfect
I was on the hunt for a perfect personal item backpack for air travel. I ordered both the Strom 20 and 25 and the bags are beautifully constructed and feel very high quality and have dimensions that would fit under an airplane seat (though I did not test it in person - I just compared dimensions online). The only reason I returned the bags (and docked a star) was because it doesn’t have a trolley sleeve/strap to slip over the handle of a suitcase. Because the grab handle is on the front of the bag, you also can’t balance the backpack on top of a carry on suitcase and hold the suitcase handle together with the grab handle from the backpack. I fly a lot and very often balance my backpack on top of carry on suitcase to have easy access to everything. Because of this both bags went back and my search continues.