Each flat bag has three dimensions. The first measurement is the width across the opening of the bag. The length runs from the bags opening to the base of the bag. Gauge is the third figure in a bags dimensions. It is a measure of its thickness in mils (1 mil bags, 2 mil bags, 3 mil bags, 4 mil bags, and 6 mil bags). Shui Shing Poly Bag Factory was founded in 1986 which produces a variety of polybags such as Poly Tubing, Garbage Bags, Industry Packing Bags, Flat Bag, Furniture Packing Bags, Ziplock Bags, Clear Poly Bags with Permanent Tape, Clear Poly Bags with Reclosable Tape, Gussted Poly Bags, etc.