Advantage on one side day glo yellow on the other this cover slips over your rucksack and keeps the worst of the weather off it the day glo yellow side can be used if the visibility drops helps you to be seen by others or in an emergency when signalling for help these covers give extra protection from rain dust or snow ideal for boat trips as it protects the rucksack and zips from sticky sea spraydouble layer rucksack cover size 1 40l advantage