Adjustable elastic shoulder straps, nylon lycra fabric breathable material to keep your body cool. No bouncing, no rubbing, no clutter.Waterproof materials and anti-theft zippers keep your valuables safe, protecting them from sweat, rain and dirt. Keep it dry and safe. This is a great product for hiking because most backpacks don't have a zipper compartment close by.Provides independent protection for your phone from scratches on the screen, cash, keys and watches from water, sand, dust and dirt. It has a water bottle and a headphone jack. Running, hiking, biking and other outdoor activities are effortless.During winter runs, you can put your bag on top of your clothes.