I just opened a Rockwood bag of charcoal that is packed in their competition bag. Most of the bags from our group buy were regular retail bags, but we got competition bags too. The competition bag is a generic bag without the Rockwood name and logo so your competitors don't know what you are cooking on. It had a little pull tab and the string just peeled back. Easiest bag of charcoal I've ever opened. Most of the time I'm fighting with the string (I never know the magic way to open the bag), or I end up taking a box cutter to the top of a bag of charcoal. Next group buy, I'll take all my bags packed this way.
Cooking on an XL and Medium in Bethesda, MD.