Moving
2. a toiletry box. Put paper, soap, toothpaste and brushes in it.
3. Documents and medicines.
4. Bedding. Put a set of bedding for each family member.
5. Clothes and underwear. Prepare clothes according to the season so that you won't have trouble finding them for two days and won't have to open all the boxes and look for the right thing. Sign the boxes on the side so that you don't have to remove and rearrange them, because they will be placed one on top of the other in a new location.
You need to make an inventory of what's in the boxes. It will take time, but believe me, such a simple and necessary action will save you much more time in the future than you will spend searching for things.
Put these 5 boxes in the car first, so that when you unload them, they will be the last to go. This way the most important things aren't stuffed with other things in the flat, but are right by the front door.
Axiom: you have no idea how much stuff you actually have. Once you start packing them up, you'll be surprised at how much stuff you have that you don't need or have forgotten about. That's why you should pay special attention to preparation.