Will MARKUS Office chair, Vissle dark grey, Medium fit in an Alfa Romeo Giulietta 2017?

The Giulietta gives you a short, wide hatch boot. The opening is 90 cm wide by 76 cm tall and the floor runs only 76 cm with the rear seats up, reaching 147 cm once you fold the bench, a gain of 71 cm. Between the wheel arches you get 102 cm, wider than the opening itself. That is the shape to plan for: plenty of width, not much length. Cases and stacked boxes suit it, long flat-packs do not. The sill sits 77 cm up with a 21 cm drop, so lower heavy boxes in rather than sliding them.

MARKUS ships as a single box of 98 cm × 59 cm × 23 cm: short by flat-pack standards but deep, closer to a stout crate than the usual thin slab. At 22.36 kg it is a one-person carry if you keep it close to your body, though the depth makes it awkward to hug through a doorway. Nearly any car takes a box like this with one rear seat folded, and bigger boots manage it without folding anything, which makes this one of the simpler IKEA collections you will do. Slide it in flat on its 59 cm side rather than upright, and load it last: a 23 cm thick box blocks more of the aperture than you expect.