This Outdoor Products Hydration Backpack in Gray is perfect for hiking with its 5.5"x17.5"x9" size. The backpack includes a convenient hydration system to keep you hydrated on the go. Please note that this backpack does not come with an H2O bladder. It is a non-domestic product with no custom bundle or personalization options. The best use for this backpack is for hiking and the color is gray. It is a modified item with the brand being Outdoor Products. The sport/activity for this backpack is also hiking.