Cooler Backpack 27 Litre (olive)Convenient on the road: ice cooled food and drinks for up to 8 days The Petromax cooling backpack 27 litres keeps your food and drinks fresh for up to 8 days on the road. With a filling capacity of 15 kg or 27 l, you make yourself independent outdoors and can be self sufficient, as you are not dependent on electricity. The comfortable back padding, chest strap and individual adjustable shoulder straps make it comfortable to carry wherever your path