I tend to pack an overnight bag when we move. So change of clothes, makeup, hairbrush, toilet roll, tissues, towel, pens and paper.
I also have the essentials box, kettle, coffee, tea, sugar long life milk, biscuits, mugs teaspoons, phone charger, contact book.
For packing i find veg boxes really good. They stack, they're readily available, they're strong and easy to carry when full. Big boxes seam like a good idea but are a pig to carry full. Even if you've hired removals teams you still end up shifting boxes to the right rooms one end or both!
Several rolls of good quality bin bags are great for bedding, towels, clothes, shoes etc. Tape a note of whats in each one so you can bung them in the right room at the other end.