Skip the bags and learn how to truss your own roasts.
I thought about that, but hanging a mesh bag seems easier than rigging a up a trussed roast. Just seems like it will be destined to fall into the pan of smoldering wood chips. Plus I also want it to make some chicken gelatin* this fall and the string bag could hold all that good stuff together to boil it.
C
* its a pressed loaf of meat containing chicken, lamb, veal and various spices. Looks like a white and red patchy loaf of lunch meat when it is finished.