Tuf-R Linear low density polyethylene (LLDPE) bags provide extra strength and puncture resistance compared to Low Density bags of the same gauge. Tuf-R linear low density polyethylene (LLDPE) bags provide extra strength and puncture resistance compared to low density bags of the same gauge. Because of this, its often possible to use a lighter gauge Tuf-R bag to do the job of a heavier gauge LDPE bag, which saves money and helps to reduce the environmental impact. Tuf-R bags are made from virgin materials, so they comply with USDA and FDA requirements for use in food applications. Gusseted bags feature creased sides that expand to accommodate bulky items.