Kiln Dried Logs Builders BagTrustpilot Traditionally referred to as a ton bag, our builders bag is generously packed above the brim of the sack. Because of this, they are excellent value for money. Stack some beside your log burner and the rest in your log store; or simply keep the full bag in your garage in the knowledge the best quality firewood is there for when you need it. Log Length 25cm (910) Log Width 2 to 6 Loose Volume 0. 7m (cubic metres) Moisture Content 20% or less