Will KALLAX Shelf unit, white, 30 1/8x57 5/8 " fit in a BMW X3 2022?

The X3 gives you a wide, level cargo bay. The hatch opens 44⅛ inches across and 31⅛ inches tall, and the floor holds 43¼ inches at its narrowest, so wide boxes that snag in smaller SUVs slide through here. Length is the catch: 37⅜ inches behind the seats, 70⅛ inches once they fold, a gain of +32⅝ inches. The floor sits level with the 27½ inch liftover, no drop on the far side, so a heavy carton pushes straight in. Save long flat-packs for seats-down trips; upright, the bay favors short, wide, stackable boxes. Slide heavy loads in across the sill and spare your back.

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.