1.1 Largest long pockets can hold your phone in the largest size. Some phones are much larger due to size. The smaller front pocket can hold credit cards, money, keys or other small items. This pocket cannot hold a large smartphone. Use a small pocket for dog treats when walking your dog. 1 headphone jack for wired headphones while walking or running, allowing you to enjoy music or talk to friends and family2. Easy and comfortable to carry everything: Keep your water bottle (water bottle not included; no fanny pack included) at a 45 degree angle to help reduce weight. Large safety buckle for easy on and off. Adjustable elastic wide shoulder straps, suitable for both men and women;3. Built-in reflective strips for safety at night, which enhances safety and visibility in the dark. All waterproof/sweatproof materials help protect your belongings from rain or sweat. The back features breathable material for a comfortable fit around the belly.4. The back is breathable and bearable, close to the body and breathable, and there is no burden to exercise