These sacks are made of lightweight but durable 28gsm polythene with a maximum capacity of 90 litres of waste these large reinforced bin bags are ideal for extra heavy duty use for a hygienic and economical waste disposal system supplied in a convenient dispenser box and with a design that prevents leakage and odours escaping for ease of disposal extra heavy duty refuse sack designed for extra heavy duty waste made of lightweight 28gsm polythene provided in flat dispenser box dimensions