Grove presumably makes/fabricates the bags. They could manufacture the source laminated film in house (at what industry would consider trivial lab, not even pilot plant, scale) which is very complex and costly, or could have a contract manufacturer make the film to their specs (which is what I'd guess). I doubt they buy off-the-shelf laminated film used for other purposes. [If there were suitable plastic films/bags commercially available, with enough stoners, also legal growers and dispensaries, interested in this topic it'd be common knowledge by now].
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