Because receiving your parcels one by one is too easy and mainstream
Went to a courier service outlet yesterday morning to pick up parcels containing my purchases that I asked the vendors to withhold shipment for many many months. ^^ Four boxes came in - two really large ones and another two smaller ones. The vendors were kind enough to inform me of the boxes' dimensions, so I was prepared before going to the courier's office. Still, bringing the boxes back was a challenge. ^^;
I was ready to slow and get my stuff in two trips, but luckily, my car is amazing in the storage department. ^^

The rear seats can be collapsed to let the box be slid through the trunk.
The top cover can be removed as well actually, but I didn't find that to be necessary when loading the box.