Luggage and bags:
Clothing/Shoes/Weather Gear: Alway take some warm clothes,in Holland. You never no what weather will be!
Toiletries and Medical Supplies: Take a medical supplies,it is very expensive if you go to dokctor,I was very often by dentist.So before you go on trip,make sure that you will be not feeling pain.
The weather in Holland can be very various. The temperature can vary between 15 and 35 degrees in the summer. Also autumn can be very different, all is possible. All seasons in every month of the year. This is a bit exaggerated ;-)
When visiting Holland bring your sweater (even in summer) and your umbrella.