A trapezoid frame on both sides is what keeps this narrow ladder shelf from wobbling once assembled - the geometry braces itself rather than relying on a back panel. Four particle board tiers each carry 33 lbs, and the whole rack holds 132 lbs. The footprint is only 14 x 14 in at 49.5 in tall, which is why it works in the corner of a bathroom, a landing or a small study. It weighs 11.4 lbs, light enough to move while cleaning. Black metal with wood-effect boards suits an industrial or minimal room.