A mammoth bag of logs is 1.2 cubic metres, plenty of firewood for winter and a great bargain too. Officially Ready to Burn. Our kiln dried hardwood logs mammoth bag is big enough to keep your fires burning throughout winter. Each bag contains 1.2 cubic metres of logs. The actual number of logs within that will vary depending upon the type of wood you opt for and the diameter of each log. Buying in bulk doesn't mean any drop in quality. Each log in our kiln dried hardwood logs mammoth bag has been dried in a kiln to create the ideal fuel. The drying process reduces moisture to between 12-20%. This means that each log burns for a longer period and gives off extra heat. As an added bonus, your logs will produce a very pleasing aroma when burned. The final advantage of kiln drying is that the logs are light, clean and easy to handle, adding convenience to the list of good reasons to buy them. Weight may vary depending on moisture content of wood and how long the wood has been in the kiln for, the dryer the wood the lighter it will be.