These sacks are made of lightweight but durable 28gsm polythene with a maximum capacity of 30 litres of waste theyre designed for use in square bins making them ideal for moderate use in office or home kitchens and washrooms as a hygienic and economical waste collection system features plastic square bin liners designed for square bins made of lightweight 28gsm polythene provided in flat dispenser box capacity 30 litres colour white pack of 1000