Micron bags (also called "rosin bags" or "press bags") are fine-mesh fabric bags used to contain hash, kief, or flower during rosin pressing. The mesh size — measured in microns (μ) — determines what passes through into the finished rosin. Common sizes: 25μ (premium hash, near-pure trichome heads), 37μ (standard hash press), 73μ (kief press), 90–160μ (flower press). Smaller-micron bags produce cleaner, more terpene-rich, less plant-matter-contaminated rosin but yield less. Larger-micron bags allow more material through (better yield) but include more particulates (slightly less clean flavor). The bag construction is typically nylon mesh sewn to be heat- and pressure-resistant. Quality bags: PurePressure (the industry standard), Bubble Bags, Frenchy Cannoli (premium hand-stitched). Reuse: bags can be re-pressed 1–3 times depending on quality and material; eventually they tear or get clogged. Bag selection is a real craft variable — choosing the right micron for the input material is part of what separates good rosin from great rosin.
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