The heavy duty fold out frame is made of 1â€ square tubular steel or aluminum. The liner is made of heavy 22 ounce PVC (Polyvinyl Chloride) coated nylon which resists chemical contamination, mildew, rot and ultraviolet exposure. The liner will withstand -40 degree temperatures and severe outdoor exposure. The seams are electronically heat sealed. The 10â€ discharge tube allows for fast emptying.