This has been discussed at length on here often by me   I have finally done a done my own test so here it is.   IBC crate measured internal volume 95cm x 115cm x 104cm = 1.1362 m3 filled with loose logs. I have stacked the logs into another crate and volume of the stacked logs is 0.7954m3 so I make the conversion ratio 1.4285. Only variable is the loose logs have settled as been in the crate many months.