I purchased this item 2-3 years ago, but it has been stored unused. I haven't even taken it out of the storage bag, so it's considered new and unused. Based on the box size, I estimate that it can accommodate firewood of about 20-30 centimeters. The box size is 65cm x 8.5cm x 8.5cm, and the item is stored inside a storage bag within the box. Thank you.