PE Films Weights and Measures Layflat Tubing, Double Wound Sheeting and Centerfold Weight per 1,000 Lineal Feet Width X Gauge X .8 = pounds per 1,000 lineal feet (mlf) Example: 17.375″ layflat tubing 4.5 mils 17.375″ X 4.5″ X .8 = 62.55 pounds per 1,000 lineal feet (mlf)