Keep cool & stay refreshed with these 10/20 Litre Cooler Bags Fabricated out of durable polyester, these cooler bags are an essential item this summer for keeping all of your favourite snacks & beverages cool. The cavernous interior of the rucksack provides you with either 10 or 20 litres of space making them perfect for chilled food, snacks, soft drinks, & beer! With a lined polyethene interior, the bags are able to keep your goodies fresh and tasty on even the hottest of summer days - perfect for long walks, hiking, camping & picnics! The bags also feature adjustable straps which are lined with a foam mesh for comfort and ventilation which can also be easily adjusted to provide maximum comfort for both adults & children.