Will BISSA Shoe cabinet with 3 compartments, white, 19 1/4x11x53 1/8 " fit in an Aiways U5 2021?

The U5 is one of the more forgiving boots to load. The opening measures 39¾″ wide by 29⅞″ tall, the floor runs 41″ with the seats up, and folding the bench takes it to 73¼″, a gain of 32¼″. Width holds at 40⅛″ at the narrowest point, so the space stays close to square. The sill sits 29⅞″ up with a ¾″ drop to the floor, near enough level to slide heavy boxes straight off the bumper. Long flat cartons suit it once the seats are down. Load those first, then pack around them.

BISSA ships as a single flat box, 54¼″ × 16¾″ × 3″, and it weighs 45 lb 15 oz. At 3″ thick it slides into gaps a built cabinet never would, so the thickness is not your problem. The length is. At 54¼″ you need a trunk that measures long enough on the floor, or one rear seat folded so the box can run forward between the seats. Most hatchbacks take it with the seats down, and any wagon or SUV swallows it flat. Lift it on edge with two hands, and rest it on a long edge rather than a corner, because 45 lb 15 oz of flat pack lands hard and the corners split first.