Low Density liners (or trash bags) are designed for trash with sharp objects. Low density liners will hold various weights and will stretch if punctured. Low Density Liners are generally white or black. While more expensive than high density, low density bags are less likely to leak liquids. Low density liners are measured in millimeters or 'mils'. Delivery is available and we offer free delivery for orders $150.00 or more. All liners are on rolls.