Will KALLAX Shelf unit, white, 30 1/8x57 5/8 " fit in a Skoda Octavia Combi 2025?

A wagon body means one thing here: length. The opening measures 40½″ wide by 30¾″ tall, the load floor runs 42⅞″ with the seats up, and folding the bench takes it to 73¼″, a gain of 30⅜″. Between the wheel arches you still get 39⅜″ of width, so long flat boxes lie flat on the floor instead of angling across it. The catch is the 30¾″ opening height: tall cartons go in on their side or not at all. The lip sits 25¼″ off the ground with a 3⅞″ step down to the floor, so slide heavy boxes across the sill instead of lifting them over it, and load the longest box first.

The KALLAX comes as a single flat carton, 59″ × 16″ × 6½″, and it carries real weight at 68 lb 5 oz for one box. It is a stiff, square-edged panel pack: not long enough to be unmanageable, but wide at 16″ and heavy enough that you will not want to hold it out at arm's length. A hatchback with the rear seats folded usually takes it, and an estate or SUV takes it without thinking. The weight is the thing to plan for. Keep it flat, slide it across the boot floor, and load it last.