Will MARKUS Office chair, Vissle dark grey, Medium fit in a Citroen C5 Aircross 2021?

The C5 Aircross boot leads with its mouth: 104 cm wide × 78 cm tall, and the floor between the arches is wider still at 106 cm, so the opening is the only gate that matters. With the seats up you work with 97 cm of floor; folded, that grows to 172 cm, a 75 cm gain. The sill sits high at 74 cm, but the floor drops just 4 cm behind it, so you slide boxes in level instead of lowering them into a pit. Wide, boxy loads suit this boot well; anything longer than the folded floor stays behind. Rest heavy packs on the sill and push rather than lift.

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.