The Outdoor Products Vortex Backpack is a tough and reliable backpack for all kinds of adventure. The blue unisex Vortex backpack features two oversize main compartments, with room for many kinds of equipment. The 30-liter Outdoor Products Vortex backpack is hydration-compatible and the hydration reservoir is sold separately. Use the front stash pocket for added storage when you need it. Attachment points on outside of pack for accessories. Included with the backpack is a Flip Top Bottle. This backpack is suitable for a senior, adult and teen. The lifetime guarantee ensures you will be using this daypack for years to come.