A bag actually works better I think. Just don't pull a full vacuum on it before sealing because you want some mobility with the liquid that will form after a day or two.
are a few of the tips I suggest, you may get an idea or two....
KCBS - CBJ
Big Green Eggs, Big Drum Smokers, Big Chiefs, Weber Smokey Joe "Custom Tall Boy"
Oil Patch Horizontal
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Barbecue is not rocket surgery