Danmuji and burdock root come in one package, pre-cut especially for kimbap. They are also sold as whole, long logs that can be cut into 1/4-inch-thick strips for kimbap. Kimbap should not be refrigerated for more than 4 hours, as the rice becomes very dry and unpleasant to eat if refrigerated beyond that. If not consuming right away, it is best to make the fillings the day before and roll the kimbap right before serving.