// Definition
Mesh screen bags (typically 25-160 micron) used to contain starting material during rosin pressing. The bag filters out plant matter and contaminants while allowing pure trichome oil to flow through under heat and pressure.
// From the Episode
In episode 032, Bubbleman described Tony Verzura squeezing his dry sift through a 1-micron filter, getting only 15% return — which was 'so depressing.' They then switched to 25-micron screen squares for better results.