Rucksack which can also be used as a saddle bag, 18lt •Rucksack which can also be used as a saddle bag. •Retractable shoulder straps to allow use as a saddle bag. •Four (4) straps for fastening to saddle. •Waterproof roll-top closure system. •Removable waterproof inner bag with IP X5 impermeability (resistant to heavy rain and extreme conditions).