Firewood varies widely in size, moisture content, and basic flammability, and it’s essential to have the proper kindling—small sticks or very narrow splits of firewood—to ignite the firewood that you’re planning to burn. Kindling is not always readily available. At outdoor campsites where you might think kindling is all over, much of the burnable kindling has already been scavenged. If you use a wood-burning stove, chiminea or fireplace often, it’s easy to run out of fire-starter materials. That’s why buying prepared kindling that’s easy to light makes sense.