Whew, been down in the Ashcan a bit too long. Anyways- in the quest for over niters I've started using larger splits and they go a long way, but still not quite enough. So the question is, how high can I pack the boc with sood safely? Right now I stuff it about 5/8 of the height of the box, the box is I'd say 1.5 cu ft. Can I stack it to the top safely..............