Will KALLAX Shelf unit, white, 30 1/8x30 1/8 " fit in a BMW X1 2024?

The X1 gives you a compact SUV boot with a fairly wide mouth, 42⅛″ across and 28⅜″ tall, but a short floor of 35⅜″ with the rear seats up. Fold them and it nearly doubles to 64⅝″, a gain of 29⅛″, which is where this boot earns its keep. It takes medium boxes and multi-package loads well, though the longest flat-packs, tall wardrobe frames and full bed rails, will not clear whether the seats are up or down. The floor narrows to 39¾″ at the back, so load the widest item first. The lip sits 28″ up with only a 1⅛″ drop to the floor, so expect a high lift then a flat slide.

The 2x2 KALLAX is one of the easiest IKEA packages you will carry: a single flat box of 31¾″ × 16¼″ × 7½″ at 37 lb 8 oz. At under 32″ long it fits in nearly any trunk without folding a seat, small hatchbacks included. The weight is the only catch: it is dense for its size and the cardboard gives you no handholds. Carry it upright against your body rather than flat by the ends, and lay it on its wide face in the trunk so it cannot flip over on the first speed bump.