Here is a wearable power bank that helps you do more with your iPhone. The MChaos Power Bank has a retractable USB-C cable. You can easily clip it to your backpack or lanyard. This power bank offers 20w fast charging. It has a 5000mAh battery. MChaos is simple to use: simply plug out the cable, and you are set. It can charge your iPhone 15 to 50% in 30 minutes.