I have been using this bag for over a year and decided I needed a back up. They are build to last and have kept all of the debris from the grains out of my brewzilla. I would recommend these bags to everyone. The customer service is also superb, they solved a shipping problem by sending a replacement bag quickly.
John Palmer says that the grist size has very little affect on efficiency rates, on average 1% for all grain brews. I’m curious as to what the actual data show for BIAB.