. Firewood is very hard to get into a bag...like stuffing a cat in a bag, just ain't happening without a fight .
Not if you know the trick. Stick wood in a metal bucket, pull bag over bucket, turn it over and remove bucket. Stuff a few more sticks into the center of the bundle and you're done.
See post#3 here: http://www.arboristsite.com/community/threads/firewood-bundler-build-pics-added.294656/#post-5788839