Will MARKUS Office chair, Vissle dark grey, Medium fit in an Alfa Romeo Giulia 2019?

The Giulia has a saloon boot, and that shapes everything you put in it. The opening is 95 cm wide by only 47 cm tall, so you post things in through a letterbox rather than dropping them into a hatch. The floor runs 94 cm with the rear seats up and 173 cm folded, but the narrow point between the arches is 67 cm, tighter than the mouth itself. Flat cases and soft bags travel well, tall boxy loads fight the lid. The sill sits 69 cm up with a 12 cm drop, so slide items over the edge instead of lifting them clear.

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.