The size of each pillow is 200mm x 200mm and there are approximately 300 air pillows in each 15 cubic foot bag. These are high quality UK manufactured air pillows and are 100% biodegradable and environmentally friendly. 30 cubic feet (ie. 2 x 15 cubic feet bags) of pre-filled biodegradable air pillows branded by Opus Bio. Also known as air cushions, these provide excellent shock absorption for goods in transit, and are great for filling the gaps/voids in your parcels as a result, helping to avoid any damage to the goods.