K-Cliffs Water-Resistant Sling Backpack | Safety Retro-Reflective Strip Durable yet lightweigh, this sling bag is water resistant with a smooth zipper and padded shoulder strap. Crossbody style strap includes an easy secure access cellphone pocket that fits most 5" smartphones. Attractive and bright coloring with 2 retroreflective stripes ensure saftey at night. There are 4 total compartments: 3 in the front and a 1 large on the side. Perfectly works as a shoulder bag, chest pack, crossbody backpack, first aid bag, or any number of uses.