https://missionengineering.com/product-category/products/power/?v=6cc98ba2045f
They guys at Mission have created a USB Power Converter for effects pedals. When powered by a battery pack, wall supply, computer USB feed or other USB device, it will deliver 1200mA of 9V DC power distributed over 4 x 150mA and 1 x 500mA feeds. They call it the 529 and I imagine it will be very handy for many. Check it out.