The PS490 is a dry bag from the Ortlieb brand. The dry bag is your ideal travel companion if you want to save space or pack as conveniently and efficiently as possible. The dry bag is equipped with a a handy roll top closure that ensures that you can easily reduce excess space. In addition, the nylon used for the bag is 100% waterproof and, once you have rolled the top down 3 times, it is also completely waterproof. Ideal for the true adventurer!