For most people, we recommend the standard size buckwheat pillow. It’s by far the most popular size and it works with any standard bedding sets and pillow cases. We think it’s the perfect size for every-night use. Many people use the smaller size for travel and it is great for kids too. The smaller size is also closer to traditional japanese-size pillows. The king size can be just as comfortable, and works great with your king size bedding. Weighing in at around 15 pounds, the Hullo in king size is a very substantial pillow.